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newSchoolWorks.com › VoTechWorks › Hospitality, Food & Tourism › Baking & Pastry › Chocolate: Tempering, Confections, and Decorative Work › Lesson 7
HOS-BAKI28-05 · Lesson 7 · 14 clock hours · lab

Molded Bonbons and Filled Chocolates

Objective. Students fill polycarbonate molds with tempered chocolate shells, pipe ganache filling to the correct level, cap the molds, and unmold bonbons with clean edges and a glossy shell free of pinholes or bloom.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a certified food-safety manager and industry professional or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

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Molded Bonbons and Filled Chocolates

Why Molded Bonbons Matter

Molded bonbons are a benchmark product in professional pastry. A glossy, crack-free shell with a clean release from the mold signals mastery of tempering, temperature management, and technique. Employers and credentialing bodies recognize this skill because it combines science, precision, and craftsmanship in a single small piece. Whether you are sitting the ACF Certified Fundamentals Pastry exam or pursuing RBA Certification, understanding what happens inside a chocolate mold — and why it goes wrong — is essential knowledge.

The Role of Tempered Chocolate in Shell Formation

The shell of a molded bonbon is only possible when chocolate is properly tempered. Tempering aligns cocoa butter crystals into the stable Form V (beta) polymorph, which contracts slightly as it solidifies. That contraction is what releases the bonbon cleanly from a polycarbonate mold and produces the characteristic gloss. Chocolate that is out of temper does not contract enough, sticks to the mold, and unmolds with a dull, streaky surface or not at all.

For dark couverture, tempering typically targets a working temperature around 88–90 °F (31–32 °C) after the seed or tabling process brings the mass through the full temperature curve. Always verify with your infrared thermometer before filling molds, because even a few degrees of deviation affects results.

Mold Preparation

Polycarbonate molds must be perfectly clean and dry before use. Any moisture causes the chocolate to seize; any grease from fingerprints dulls the gloss. Polish each cavity thoroughly with a dry lint-free cotton cloth using firm circular strokes until the surface shines. Inspect cavities against a light source. Never use soap or abrasive cleaners — they leave residue and scratch the polycarbonate, which transfers imperfections to every bonbon made in that mold.

Molds should be at room temperature (approximately 65–68 °F / 18–20 °C) before filling. Cold molds cause the chocolate to set too quickly, trapping air and thickening the shell unevenly. Warm molds slow setting and can cause bloom.

Creating the Shell

Fill the entire mold cavity with tempered chocolate, overfilling slightly. Immediately tap the mold firmly on the bench several times to release air bubbles — bubbles left in place become pinholes visible on the finished surface. Invert the mold over your bowl, tap again so excess chocolate falls out, then hold it inverted and scrape the flat face clean with a bench scraper in one confident stroke. Place the mold face-down on parchment or a wire rack and allow it to set at room temperature.

The target shell thickness is approximately 2–3 mm. A shell that is too thin (<1.5 mm) will crack during unmolding; one that is too thick (>4 mm) reduces the ratio of filling to shell and affects eating quality. Your instructor will evaluate shell thickness before you proceed — do not skip this checkpoint.

Filling with Ganache

Ganache must be at room temperature and fluid enough to pipe smoothly but below approximately 85 °F (29 °C) so it does not melt the shell. Pipe ganache into each cavity, stopping approximately 2 mm below the top edge of the shell. This gap is critical: it leaves room for the capping layer without overfilling, which causes messy, weak seals. If ganache is piped flush or above the edge, the cap cannot bond properly and the bonbon will split on unmolding or during storage.

Allow the ganache surface to develop a slight skin (crystallize) before capping. This usually takes 20–30 minutes at room temperature depending on humidity and ganache formulation. Do not refrigerate the filled, uncapped mold — condensation will form and ruin the cap bond.

Capping and Refrigeration

Once the ganache has set a skin, flood the surface of the mold with freshly tempered chocolate. Scrape the face of the mold flush in one clean stroke with your bench scraper. The cap must be scraped completely flat and level with the mold face; high spots will prevent clean unmolding. Refrigerate the capped mold at approximately 55–60 °F (13–16 °C) for 15–20 minutes. Avoid colder temperatures — rapid chilling can cause condensation and bloom on unmolding.

Unmolding and Quality Evaluation

When properly tempered chocolate has contracted, it will release from the mold with a light twist or tap. Do not force the mold; if pieces resist, return to the refrigerator for a few more minutes. Forced unmolding breaks edges and causes the surface to crack.

Evaluate each piece systematically: gloss (mirror-like surface), edge sharpness (clean, flat cap with no ragged edges), absence of pinholes, and correct fill level (check with a cross-section cut on at least one piece per batch). Document defects and their probable causes in your lab log with a written corrective action — this habit directly supports the diagnostic thinking tested in credentialing exams.

Safety in the Chocolate Lab

Working with chocolate requires attention to several hazards. Hot sugar or high-temperature ganache components can cause serious burns — use heat-resistant gloves when handling pots above 140 °F (60 °C). Keep your work area dry: water near melted chocolate causes spattering and steam burns. Use caution with double boilers and induction units — ensure handles are turned inward and units are stable. Polycarbonate molds can shatter if dropped on a tile floor, creating sharp projectile fragments; carry them with both hands. Refrigerator doors and wire racks have sharp metal edges — mind your hands when loading and unloading. Report any cut or burn to your instructor immediately.

Key terms10

Tempered chocolateChocolate in which cocoa butter has been guided through a controlled heating and cooling process to form stable Form V (beta) crystals, resulting in gloss, snap, and mold release.
Polycarbonate moldA rigid, food-safe plastic mold used for molded bonbons; its smooth, non-porous surface transfers gloss to properly tempered chocolate and releases clean shells due to cocoa butter contraction.
ShellThe outer chocolate layer of a molded bonbon, formed by flooding the mold cavity with tempered chocolate, inverting to drain excess, and allowing the remaining layer to set; target thickness is approximately 2–3 mm.
Cap (capping layer)The final layer of tempered chocolate applied over the piped filling to seal the bonbon inside the mold; scraped flush with the mold face before the mold is refrigerated.
GanacheAn emulsion of chocolate and cream (and sometimes other ingredients) used as a filling for bonbons; must be piped at room temperature to avoid melting the shell and stopped 2 mm below the shell edge.
BloomA dull, gray-white streaking or powdery film on chocolate caused by either fat bloom (unstable cocoa butter crystals migrating to the surface) or sugar bloom (moisture dissolving and recrystallizing surface sugar).
PinholeA small void or hole in the chocolate shell surface caused by an air bubble that was not tapped out during shell creation; a quality defect that allows filling to be visible and weakens the shell.
CouvertureHigh-quality chocolate with a higher percentage of cocoa butter than standard chocolate, making it fluid enough to coat and mold thinly when tempered; required for professional bonbon work.
ContractionThe slight physical shrinkage that properly tempered chocolate undergoes as it solidifies and cocoa butter crystals pack tightly; this contraction is what allows clean release from a polycarbonate mold.
Infrared thermometerA non-contact thermometer that reads surface temperature instantly; used in the chocolate lab to verify the working temperature of tempered chocolate before filling molds without contaminating the mass.

Worked examples4

1. You fill a 12-cavity mold and invert it to drain. After setting, you measure three shells and get thicknesses of 1.8 mm, 2.4 mm, and 2.1 mm. What is the average shell thickness, and does it fall within the 2–3 mm target?
  1. Add the three measurements: 1.8 + 2.4 + 2.1 = 6.3 mm.
  2. Divide by the number of measurements: 6.3 ÷ 3 = 2.1 mm.
  3. Compare to the target range of 2–3 mm: 2.1 mm falls within this range.
  4. Note that one shell at 1.8 mm is below the target minimum; that individual cavity may be at risk of cracking during unmolding, so monitor it during the unmolding step.
Answer: Average shell thickness is 2.1 mm, which is within the 2–3 mm target. The 1.8 mm shell is below range and should be monitored.
2. Each cavity in your mold holds 12 mL total volume. You form a shell that occupies approximately 4 mL of that volume. You pipe ganache to leave a 2 mm head space for the cap, and the cap layer takes up approximately 2 mL. How many milliliters of ganache should fill the remaining space?
  1. Total cavity volume: 12 mL.
  2. Shell volume: 4 mL.
  3. Cap volume: 2 mL.
  4. Volume accounted for by shell and cap: 4 + 2 = 6 mL.
  5. Remaining volume for ganache: 12 − 6 = 6 mL.
  6. Note: the 2 mm head space referenced in the lesson is the physical gap left between the top of the piped ganache and the mold face; the cap chocolate fills that gap, consistent with the 2 mL cap value used here.
Answer: Approximately 6 mL of ganache should fill each cavity.
3. You are working with dark couverture. Your infrared thermometer reads 93 °F on the surface of the mass. The target working temperature is 88–90 °F. By how many degrees Fahrenheit is your chocolate above the upper end of the target, and what should you do?
  1. Identify the upper end of the working range: 90 °F.
  2. Subtract from the current reading: 93 − 90 = 3 °F above range.
  3. Chocolate at 93 °F is likely out of temper or on the verge of losing temper because the Form V crystals begin to melt out above the working range.
  4. Corrective action: stir in additional tempered chocolate (seed method) or cool the bowl carefully by placing it briefly over cold water while stirring continuously, then recheck the temperature before filling molds.
Answer: The chocolate is 3 °F above the upper working limit. Cool and re-seed or stir over cold water, recheck temperature, and verify temper with a test smear before proceeding.
4. You have 12 bonbons. Your pass criterion requires satisfactory on at least 3 of 4 rubric criteria on a minimum of 8 of 12 pieces. After evaluation, 9 pieces pass gloss, 10 pass clean edges, 7 pass no pinholes, and 8 pass correct fill level. How many pieces achieved satisfactory on at least 3 of 4 criteria, and does the batch meet the minimum threshold? (Assume the 7 pieces that pass pinholes are a subset of those passing the other criteria, and use the data to reason about the worst-case scenario.)
  1. List the criterion pass counts: Gloss = 9, Edges = 10, Pinholes = 7, Fill = 8. Total cavities = 12.
  2. Identify the criterion with the fewest passes: Pinholes at 7, meaning 5 pieces have pinhole defects.
  3. In the worst case, those 5 pieces with pinholes could also be among the failures in other criteria. Gloss failures = 3, Edge failures = 2, Fill failures = 4.
  4. Total individual failures across all criteria: 3 + 2 + 5 + 4 = 14 failures across 12 pieces.
  5. If failures concentrate in the fewest pieces, distribute 14 failures across 12 pieces: 14 ÷ 12 ≈ 1.17 failures per piece on average, so most pieces fail only 1 criterion, meaning most pass at least 3 of 4.
  6. Worst-case stacking: the 5 pinhole pieces could also carry other failures. Even if all 3 gloss failures, 2 edge failures, and 4 fill failures each landed on the same 5 pinhole pieces, those 5 pieces would have multiple failures. The remaining 7 pieces would pass all four criteria. That gives at least 7 pieces meeting the 3-of-4 threshold.
  7. The requirement is at least 8 pieces. With only 7 confirmed in this worst case, the batch is borderline; the actual outcome depends on how failures overlap. Collect real per-piece data on your evaluation form to determine the true count.
Answer: At minimum 7 pieces achieve the 3-of-4 threshold in the worst-case overlap scenario, which does not meet the minimum of 8. Real per-piece evaluation data from your lab log is needed for a definitive pass/fail determination.

The math in this lesson1

Learners average three bonbon shell thicknesses to 2.1 mm and check against a 2–3 mm range.
S-ID.2
Brush up in the math halls at newSchoolWorks.com:
In class: Mold preparation and shell creation: students polish molds with cotton, fill with tempered dark chocolate, tap out air bubbles, invert and scrape, then allow to set; instructor critiques shell thickness (target approximately 2–3 mm) before students proceed. · Filling and capping: students pipe room-temperature ganache to within 2 mm of the mold edge (to allow for the cap), allow to crystallize, then seal with a layer of tempered chocolate; excess is scraped flush and molds are refrigerated. · Unmolding and quality evaluation: students unmold, photograph the finished pieces, and complete a self-evaluation form rating gloss, edge sharpness, pinhole frequency, and flavor against the product spec; defective pieces are diagnosed in the lab log with a written corrective action.
Materials: Polycarbonate bonbon molds; cotton polishing cloths; dark and milk couverture; ganache (prepared from previous lesson or fresh batch); piping bags; bench scraper; offset spatulas; infrared thermometer; refrigerator; digital camera or phone; lab logs
Check: Instructor assesses unmolded bonbons on a four-criterion rubric (gloss, clean edges, no pinholes, correct fill level visible on cross-section cut); students must achieve satisfactory on at least three of four criteria on a minimum of eight of twelve pieces.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Pastry production techniques and quality standards
1. Why must polycarbonate molds be polished with a dry cotton cloth before filling them with tempered chocolate?
Pastry production techniques and quality standards
2. A student inverts the filled mold to drain excess chocolate but forgets to tap it on the bench before inverting. Which defect is most likely to appear in the finished bonbons?
Pastry production and confectionery fundamentals
3. Ganache is piped into a shell cavity but reaches the very top edge of the shell, leaving no gap. What problem will this most likely cause when capping?
Chocolate science and confectionery production
4. After capping, a student places the mold in a refrigerator set at 38 °F (3 °C) to speed up setting. What is the most likely negative outcome?
Chocolate tempering and working temperatures
5. An infrared thermometer reads 84 °F (29 °C) on a batch of dark couverture intended for shell production. The working temperature target is 88–90 °F (31–32 °C). What is the most appropriate corrective action?
Chocolate science and confectionery fundamentals
6. Which of the following is the primary reason properly tempered chocolate releases cleanly from a polycarbonate mold?
Pastry production techniques and quality evaluation
7. During the unmolding step, a student applies strong downward force because the bonbons are not releasing. What is the safest and most technically correct response?
Chocolate science, defect diagnosis, and corrective action
8. A student's lab log shows that six out of twelve bonbons have a dull, gray surface with streaks, even though the molds were properly polished. The ganache was piped cold at approximately 55 °F (13 °C). Which is the most likely cause of the dull surface?
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