(Almost) instant demi-glace
(Almost) instant demi-glace is a medium French recipe that serves 12. 15 calories per serving. Recipe by Adam Ragusea on YouTube.
Prep: 15 min | Cook: 2 hrs 10 min | Total: 2 hrs 45 min
Cost: $6.38 total, $0.53 per serving
Ingredients
- 6 quarts Low‑Sodium Chicken or Veal Stock (store‑bought, preferably unsalted; any high‑quality broth works)
- 6 teaspoons Tomato Paste (adds caramelized color and umami; use a low‑sodium brand if possible)
- 6 teaspoons Low‑Sodium Soy Sauce (provides depth similar to roasted bones; does not make the sauce taste Asian)
- 3 teaspoons Onion Powder (optional but adds background flavor; many broths already contain onion)
- 6 packets Unflavored Gelatin (powder) (each packet ~7 g; use pork‑free (halal/kosher) if needed; sprinkle to avoid clumps)
- 2 tablespoons Unsalted Butter (optional finishing butter for the pan sauce; adds sheen)
- 1 teaspoon Fresh Thyme (optional garnish for finished sauce)
Instructions
Measure and Prepare Ingredients
Gather 6 quarts low‑sodium stock, 6 tsp tomato paste, 6 tsp low‑sodium soy sauce, 3 tsp onion powder, and 6 packets gelatin. Have butter and thyme nearby if you plan to finish a pan sauce later.
Time: PT5M
Combine Base Ingredients in Pot
Pour the stock into the large pot. Add tomato paste, soy sauce, onion powder, and sprinkle the gelatin packets over the surface. Stir gently to disperse the gelatin and prevent clumping.
Time: PT5M
Bring to a Boil and Dissolve Gelatin
Place the pot over medium‑high heat. Bring to a rolling boil, stirring occasionally, until the gelatin is fully dissolved and the tomato paste just begins to brown at the bottom (do not let it burn).
Time: PT10M
Temperature: Medium‑High
Reduce to One‑Sixth Volume
Reduce the heat to maintain a steady, vigorous boil. Let the liquid reduce until the volume is roughly one‑sixth of the original (about 1 qt left). This takes about 2 hours; stir occasionally and scrape any browned bits from the sides back into the liquid.
Time: PT2H
Temperature: Medium‑High
Cool Slightly and Portion
Remove the pot from heat and let the demi‑glace cool for a few minutes. Pour the hot liquid into a standard ice‑cube tray, filling each compartment about three‑quarters full.
Time: PT5M
Freeze and Store
Place the tray in the freezer until solid (about 2‑3 hours). Pop the cubes out, transfer to a freezer‑safe zip bag, label with date, and store in the freezer for up to 2 months.
Time: PT0M
Temperature: Freezer
Optional: Finish a Pan Sauce (example with hanger steak)
Sear a seasoned hanger steak in a hot skillet, add butter and baste. Deglaze with a splash of red wine, then add 2‑3 demi‑glace cubes. Reduce until syrupy, finish with a knob of cold butter and fresh thyme.
Time: PT15M
Temperature: Medium
Nutrition Facts
- Calories
- 15
- Protein
- 0 g
- Carbohydrates
- 2 g
- Fat
- 0 g
- Fiber
- 0 g
Dietary info: Low‑sodium, Gluten‑free (if gluten‑free broth used), Paleo‑compatible (omit butter)
Allergens: Gelatin (pork unless halal/kosher), Soy (soy sauce)
Ingredient Substitutions
- Instead of Low‑Sodium Chicken or Veal Stock: low‑sodium beef broth, homemade reduced veal stock
- Instead of Tomato Paste: ketchup (reduced amount), sun‑dried tomato puree
- Instead of Low‑Sodium Soy Sauce: tamari (low‑sodium), liquid aminos
- Instead of Onion Powder: finely minced fresh onion (added at start)
- Instead of Unflavored Gelatin (powder): agar‑agar (use less, adjust method)
- Instead of Unsalted Butter: olive oil (for a lighter finish)
- Instead of Fresh Thyme: dried thyme (½ tsp)
Equipment Needed
- Large Stockpot (8‑qt or larger)
- Measuring Spoons
- Whisk or Wooden Spoon
- Fine Mesh Sieve (optional)
- Ice Cube Tray
- Freezer‑Safe Zip Bag
- Cast‑Iron or Carbon Steel Skillet
- Instant‑Read Thermometer
- Tongs
- Cutting Board
- Chef’s Knife
Critical Steps — Do Not Skip
- Browning the tomato paste just enough to develop flavor without burning
- Reducing the stock to exactly one‑sixth of its original volume
- Ensuring the gelatin is fully dissolved before reduction
Chef Tips from the Video
- Use the lowest‑sodium broth you can find; the reduction concentrates salt quickly.
- A splash of red wine in the final pan sauce adds acidity that balances the richness of the gelatin.
- If you prefer a richer color, add a pinch of smoked paprika with the tomato paste.
Troubleshooting
The reduction sticks to the pot and burns
Lower the heat slightly and stir more frequently; deglaze the stuck bits with a splash of water or wine.
Gelatin clumps and does not dissolve
Sprinkle gelatin over the cold stock before heating, or whisk vigorously as the liquid comes to a simmer.
Final sauce is too salty
Use a lower‑sodium broth next time or add a splash of water when reducing.
Storage
Refrigerator: Use within 3 days; keep in an airtight container.
Freezer: Best stored in freezer bags for up to 2 months.
Room temperature: Do not store at room temperature; gelatin will melt and spoil.
Make-Ahead Tips
- Freeze the demi‑glace in ice‑cube trays; each cube is a single‑serving portion for sauces.
- The cubes can be stored in a zip bag for quick grab‑and‑go use.
- If you need a thicker glaze, reduce a cube further in a small saucepan before adding to a dish.
Frequently Asked Questions
What is the cultural significance and history of demi‑glace in French cuisine?
Demi‑glace originated in classic French haute cuisine as a highly reduced veal stock combined with espagnole sauce, serving as a foundation for many sauces. It represents the French tradition of extracting maximum flavor from bones and aromatics through long reductions.
What are the traditional regional variations of demi‑glace in French cooking?
In classic French cooking, demi‑glace is made from veal bones, while some regional versions use beef or pork bones, and occasionally add mushrooms or truffles for depth. Modern variations may substitute chicken stock for affordability, as demonstrated in this recipe.
How is demi‑glace traditionally served in French restaurants?
Traditionally, demi‑glace is strained, reduced to a glossy glaze, and used as the base for sauces like sauce bordelaise or sauce au poivre, poured over grilled meats, game, or roasted poultry at the table.
What occasions or celebrations is demi‑glace traditionally associated with in French cuisine?
Demi‑glace is a staple for formal French meals such as holiday feasts, wedding banquets, and fine‑dining courses where it elevates prime cuts of meat like filet mignon, rack of lamb, or duck breast.
What authentic ingredients are used in traditional demi‑glace versus the shortcuts in this recipe?
Traditional demi‑glace uses roasted veal bones, mirepoix, tomato purée, and espagnole sauce, reduced over many hours. This shortcut replaces the bones with low‑sodium broth, adds tomato paste, soy sauce, onion powder, and gelatin to mimic the depth and texture.
What other French dishes pair well with this homemade demi‑glace?
This demi‑glace pairs beautifully with classic French dishes such as steak au poivre, coq au vin, braised short ribs, and mushroom‑laden sauces for chicken or pork.
What are the most common mistakes to avoid when making this demi‑glace?
Common errors include burning the tomato paste, reducing the stock too far so it becomes syrupy and overly salty, and not fully dissolving the gelatin which can leave gritty pockets. Stir frequently and watch the volume closely.
Why does this recipe use low‑sodium soy sauce instead of additional roasted bones?
A small amount of low‑sodium soy sauce supplies the umami compounds (glutamates) that develop naturally when bones are roasted, providing depth without the need for expensive veal bones.
Can I make the demi‑glace ahead of time and how should I store it?
Yes. Freeze the reduced sauce in ice‑cube trays. Once solid, transfer the cubes to a freezer‑safe bag; they keep for up to two months and can be dropped directly into a pan sauce when needed.
What texture and appearance should I look for when the demi‑glace is done reducing?
The liquid should be thick enough to coat the back of a spoon and have a glossy, deep mahogany color. It should not be so thick that it clings like caramel; a pourable glaze is ideal.
How do I know when the demi‑glace is done cooking?
When the volume has reduced to about one‑sixth of the original (approximately 1 quart from 6 quarts) and the surface is glossy, the demi‑glace is ready. A spoon‑test for coating confirms readiness.
What does the YouTube channel Adam Ragusea specialize in?
The YouTube channel Adam Ragusea focuses on science‑based cooking tutorials, kitchen technique explanations, and practical recipes that balance flavor, cost, and accessibility for home cooks.
How does the YouTube channel Adam Ragusea's approach to French cooking differ from other French cooking channels?
Adam Ragusea emphasizes inexpensive shortcuts, clear explanations of the chemistry behind classic techniques, and often uses readily available grocery‑store ingredients, whereas many French channels stick to traditional, ingredient‑intensive methods.
Last updated: August 28, 2026
