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Pressure-Roasted Brown Stock (Fond Brun)

Chapter 10 · Stocks, Sauces & Condiments

Pressure-Roasted Brown Stock (Fond Brun)

French Stock Technique Folio pressure cookingbrown stockveal bonesmirepoixtomato pastepincagegelatinred wineMaillard reactioncaramelization

Deeply caramelized, gelatin-rich veal stock extracted under high pressure.

Yield: ~2.5 Liters | Prep: 45 min | Cook: 2 hr (Pressure) | Total: ~4 hr

Headnote

While traditional brown stock requires 8–12 hours of simmering to extract gelatin, the pressure cooker elevates the boiling point of water to ~250°F (121°C). This allows the Maillard reaction to continue even while the bones are submerged, resulting in a stock with profound depth and a darker color in a fraction of the time. Teaching Idea: The Pincage. To achieve the signature mahogany color of a true fond brun, we roast tomato paste onto the mirepoix until it turns rust-colored. This process, called pincage (pin-sahj), caramelizes the sugars in the tomato and reduces acidity.

Ingredients

The Base

  • 2000 g (4.5 lbs) Veal or Beef Knuckle Bones (split to expose marrow)
  • 30 ml (2 tbsp) Neutral Oil (Vegetable or Grapeseed)

The Mirepoix & Aromatics

  • 300 g (2 medium) Yellow Onions, rough chop (skin on for color)
  • 150 g (2 stalks) Carrots, rough chop
  • 150 g (2 stalks) Celery, rough chop
  • 60 g (¼ cup) Tomato Paste
  • 5 g (1 tsp) Black Peppercorns, whole
  • 2 g (2 leaves) Bay Leaves, fresh or dried
  • 5 g (4 sprigs) Fresh Thyme

The Liquid

  • 240 ml (1 cup) Dry Red Wine (Cabernet or Merlot)
  • 2500 ml (2.5 qt) Cold Water (approximate, enough to cover bones)

Mise en Place (Action Checklist)

  • Prep the Bones: Preheat oven to 450°F/230°C. Arrange bones in a single layer on a sheet pan.
  • Prep the Veg: Wash and rough chop the mirepoix (onions, carrots, celery).
  • Ready the Pot: Ensure your pressure cooker (minimum 6–8 quart) is clean and the seal is intact.
  • Warm the Liquid: Have the wine ready for deglazing and cold water accessible for filling.

Method

Phase 1: The Roast.

  1. Roast Bones: Toss the bones with the neutral oil to coat. Roast in the 450°F (230°C) oven for 45–60 minutes, turning halfway through, until they are deep dark brown.

Why: Deep browning creates the foundation of the flavor profile via the Maillard reaction.

  1. Drain Fat: Remove bones from the pan and transfer them to the pressure cooker pot. Discard the rendered fat from the roasting pan, but keep the brown bits (fond) stuck to the bottom.

Phase 2: The Pincage & Deglaze.

  1. Sauté Mirepoix: In a separate skillet or directly in the pressure cooker (if it has a sauté mode), add a splash of fresh oil and the onions, carrots, and celery. Sauté until the vegetables begin to brown (about 8–10 minutes).
  2. Pincé: Add the tomato paste to the vegetables. Stir constantly for 2–3 minutes until the paste darkens from bright red to a brick/rust color.

Sensory Cue: The scent will change from raw tomato to sweet and roasted.

  1. Combine: Add the caramelized vegetable mixture to the pot with the bones.
  2. Deglaze: Place the roasting sheet (used for bones) over a burner on medium heat. Pour in the red wine. Scrape up the stuck brown bits (fond) with a wooden spoon or spatula.
  3. Pour: Add this wine-fond liquid into the pressure cooker pot.

Phase 3: Pressure Extraction.

  1. Fill: Cover the bones and vegetables with cold water. Do not fill past the “Max Fill” line of your pressure cooker.

Why: Starting with cold water promotes clearer extraction of proteins.

  1. Add Aromatics: Toss in the peppercorns, bay leaves, and thyme.
  2. Cook: Seal the lid. Bring to High Pressure (15 psi). Cook for 2 hours.
  3. Natural Release: Turn off the heat and allow the pressure to release naturally (about 20–30 minutes). Critical: Do not use the “Quick Release” valve. The violent boiling caused by rapid depressurization will emulsify the fat and make the stock cloudy and greasy.

Phase 4: Clarification & Storage.

  1. Strain: Carefully pour the stock through a fine-mesh sieve (chinoise) into a clean container. Do not press on the solids, or you will cloud the stock.
  2. Chill: Place the container in an ice bath to cool rapidly to below 40°F (4°C).
  3. Defat: Once fully chilled, the fat will form a solid cap on the surface. Lift this off with a spoon before using or freezing the stock.

Chef’s Notes

  • The Jelly Standard: A properly made brown stock should set into a firm, wiggly jelly (meat jello) when chilled. This indicates high gelatin content, which gives sauces like Espagnole their velvety mouthfeel.
  • Salt: Never salt a stock during production. Stock is an ingredient that will be reduced later; salting now could result in an inedibly salty sauce after reduction.
  • Remouillage: You can reuse the bones for a “second wash” (Remouillage). Cover the used bones with water and pressure cook for another 2 hours. The result will be weaker but perfect for use as the liquid in your next batch of stock.

Glossary

  • Fond Brun: French for “Brown Stock.”
  • Maillard Reaction: A chemical reaction between amino acids and reducing sugars that gives browned food its distinctive flavor.
  • Pincé: The culinary technique of cooking tomato paste until it caramelizes and turns brown.
  • Mirepoix: A flavor base made from cooked diced vegetables, usually onions, carrots, and celery.