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newSchoolWorks.com › VoTechWorks › Hospitality, Food & Tourism › Culinary Arts › Stocks, Sauces, and Classical Sauce Work › Lesson 5
HOS-CULI27-03 · Lesson 5 · 14 clock hours · lab

Espagnole and Demi-Glace

Objective. Students will prepare sauce espagnole and reduce it with remouillage to produce demi-glace that coats a spoon and passes instructor flavor evaluation.

⚠ 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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Espagnole and Demi-Glace

Why These Sauces Matter

Espagnole is one of the five French mother sauces codified in classical cuisine. From it descends demi-glace, the backbone of hundreds of derivative sauces served in professional kitchens every day. Mastering these two preparations means you can produce rich, deeply flavored sauces from scratch—a skill that separates trained culinarians from line cooks who open a jar. The ACF Certified Culinarian exam expects you to know mother sauces and their derivatives, so this lab is both practical and credential-relevant.

Brown Roux: The Foundation

Roux is equal parts fat and flour by weight, cooked together to remove the raw flour taste and develop color. For espagnole you use a brown roux, which means cooking it longer than a blonde or white roux. As roux darkens, the starch granules partially break down, so darker roux has less thickening power than pale roux—you will need more of it, or a longer cook, to achieve the same body. Color progresses in stages:

Use your color reference card at each stage. Stir continuously once the roux begins to deepen in color; the bottom of a heavy-bottomed pan can scorch in seconds.

Safety: Hot roux reaches temperatures well above the boiling point of water and will cause severe burns on contact with skin. Wear your chef's coat with sleeves down and use dry side towels—never wet cloths—when handling hot pans. Add cold or room-temperature liquid to hot roux gradually and off direct heat if needed; adding cold liquid too fast causes violent spattering. Keep your face away from the pot when whisking in stock.

Building Espagnole

Classic espagnole combines brown roux, brown stock, a tomato product (paste or purée adds color and acidity), and mirepoix. The process:

1. Cook mirepoix in fat until caramelized—this adds sweetness and depth.

2. Add tomato paste or purée and cook briefly to eliminate raw tomato flavor (called pinçage).

3. Add brown roux and incorporate fully before adding stock.

4. Add brown stock gradually, whisking to prevent lumps.

5. Add bouquet garni. Bring to a simmer.

6. Skim the surface frequently—impurities rise as gray or brown foam and must be removed for a clean, clear sauce.

7. At the 90-minute mark, strain through a china cap lined with cheesecloth. Taste against the instructor benchmark: the sauce should be savory, mildly rich, and smooth.

Proper skimming is what separates a professional sauce from a murky one. Pull the pot to one side of the burner so impurities collect on the cooler side and are easier to remove.

Remouillage and the Demi-Glace Reduction

Remouillage (French for "rewetting") is a second, lighter stock made by simmering the bones already used for the primary brown stock. It has less body and gelatin than the primary stock but is still flavorful. Classical technique combines espagnole and remouillage in equal parts and reduces the mixture by half to produce demi-glace—literally "half glaze."

As the reduction proceeds, water evaporates, concentrating gelatin, flavor compounds, and pigment. The finished demi-glace should:

Document your start volume and finish volume in the reduction log. You will calculate percent reduction as part of your lab grade.

The Nappe Test

Dip a clean metal spoon in the sauce and hold it horizontally. Run your finger across the back. If the sauce holds the line without running back together, it has reached nappe consistency. If the line collapses, reduce further. If the sauce is too thick to pass at all, it has gone too far—add a small amount of hot stock to adjust.

Food Safety Reminders

Brown stock and espagnole are potentially hazardous foods (time/temperature control for safety foods, or TCS foods). Keep them out of the temperature danger zone (41°F–135°F) whenever possible. Cool finished demi-glace rapidly using an ice bath and shallow containers before refrigerating. Label and date all storage containers. ServSafe principles require that sauces held hot for service stay at or above 135°F.

Lab Workflow Summary

| Phase | Task | Key Check |

|---|---|---|

| 1 | Brown roux | Color reaches brick stage |

| 2 | Espagnole assembly & simmer | Taste benchmark at 90 min |

| 3 | Combine with remouillage, reduce | Nappe test + volume log |

Work cleanly, skim consistently, and taste at every stage. A great demi-glace is built on patience and attention—not shortcuts.

Key terms9

EspagnoleOne of the five classical French mother sauces; made from brown roux, brown stock, mirepoix, tomato product, and a bouquet garni.
Demi-glaceA rich, concentrated sauce produced by combining espagnole and remouillage in equal parts and reducing the mixture by half.
Brown rouxA cooked mixture of equal parts fat and flour that has been cooked to a deep brick color; provides thickening and a toasted, nutty flavor with less thickening power than lighter roux.
RemouillageA second, lighter stock made by re-simmering bones already used for a primary stock; used in combination with espagnole to make demi-glace.
NappeThe consistency at which a sauce coats the back of a spoon and holds a clean line when a finger is drawn across it.
PinçageThe technique of cooking tomato paste or purée in fat briefly before adding liquid, to caramelize sugars and remove the raw tomato flavor.
MirepoixA classic aromatic base of roughly chopped onion, carrot, and celery used to flavor stocks and sauces; the standard ratio is 2 parts onion to 1 part each carrot and celery.
Bouquet garniA bundle of herbs and aromatics—typically parsley stems, thyme, and bay leaf—tied together or wrapped in cheesecloth and added to a stock or sauce during cooking, then removed before service.
TCS food (Time/Temperature Control for Safety food)A food that requires careful control of time and temperature to prevent the growth of harmful microorganisms; stocks and sauces fall into this category.

Worked examples4

1. You start with 4 quarts of combined espagnole and remouillage mixture. After reduction you have 2 quarts. What is the percent reduction?
  1. Identify the starting volume: 4 quarts.
  2. Identify the finishing volume: 2 quarts.
  3. Calculate the volume lost: 4 − 2 = 2 quarts.
  4. Divide volume lost by starting volume: 2 ÷ 4 = 0.50.
  5. Multiply by 100 to express as a percentage: 0.50 × 100 = 50%.
Answer: The sauce reduced by 50%, which is exactly the target for demi-glace.
2. Your reduction log shows you started with 3.5 quarts and finished with 1.75 quarts. Did you hit the 50% reduction target?
  1. Identify the starting volume: 3.5 quarts.
  2. Identify the finishing volume: 1.75 quarts.
  3. Calculate volume lost: 3.5 − 1.75 = 1.75 quarts.
  4. Divide volume lost by starting volume: 1.75 ÷ 3.5 = 0.50.
  5. Multiply by 100: 0.50 × 100 = 50%.
Answer: Yes, 50% reduction achieved. The finished volume is exactly half the starting volume, meeting the demi-glace standard.
3. A recipe calls for a brown roux using 4 ounces of clarified butter. How many ounces of flour are needed, and what is the total roux weight?
  1. Roux is made with equal parts fat and flour by weight.
  2. Fat = 4 ounces, so flour = 4 ounces.
  3. Total roux weight = 4 + 4 = 8 ounces.
Answer: 4 ounces of flour; total roux weight is 8 ounces.
4. You begin with 6 quarts of the espagnole-remouillage mixture and want exactly 50% reduction. At what finishing volume should you stop, and how many quarts will you have lost?
  1. Target reduction = 50%, so the finish volume = starting volume × (1 − 0.50).
  2. Finish volume = 6 × 0.50 = 3 quarts.
  3. Volume lost = 6 − 3 = 3 quarts.
Answer: Stop at 3 quarts; you will have lost 3 quarts to evaporation.

The math in this lesson1

Learners compute a 50% reduction from 4 quarts to 2 quarts of demi-glace.
7.RP.3
Brush up in the math halls at newSchoolWorks.com:
In class: Brown roux production: students make a brown roux in a heavy saucepan, monitoring color stages from blonde to peanut butter to brick using a color reference card, and discuss the effect of roux color on thickening power. · Espagnole assembly: students combine brown roux, brown stock, tomato product, and mirepoix; students skim, strain, and taste against instructor benchmark at the 90-minute mark. · Demi-glace reduction: students combine espagnole with remouillage in equal parts and reduce by half; nappe test performed with a spoon; students document start and finish volumes to calculate percent reduction.
Materials: Brown stock (from prior labs), remouillage, clarified butter, bread flour, tomato paste or purée, mirepoix, bouquet garni, heavy-bottomed saucepans, wooden spoons, ladles, china cap, cheesecloth, spoons for nappe test, reduction log worksheet
Check: Demi-glace coats the back of a spoon cleanly (nappe test), has deep savory flavor per instructor evaluation, and reduction percentage is documented; pass requires all three criteria.

Practice check8

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

Culinary techniques and classical sauce work
1. Which best describes the relationship between roux color and thickening power?
Culinary techniques and classical sauce work
2. What is the classical ratio of espagnole to remouillage when producing demi-glace?
Kitchen safety and food handler practices
3. A student adds ice-cold stock very quickly to a pan of extremely hot brown roux. What is the most likely immediate hazard?
Culinary techniques and classical sauce work
4. Which technique correctly describes the nappe test for demi-glace?
Culinary knowledge and ACF competencies
5. Espagnole is classified as which type of sauce in classical French cuisine?
Food safety and ServSafe principles
6. At what temperature range is a sauce considered to be in the temperature danger zone, creating a food safety risk?
Culinary math and measurement
7. You begin a demi-glace reduction with 5 quarts of liquid. After 2 hours you have 3 quarts remaining. What is your current percent reduction?
Culinary techniques and classical sauce work
8. Why is skimming the surface of espagnole frequently during simmering important?
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