The brown mother: dark roux, browned mirepoix, tomato, and beef stock simmered into deep savory brown velvet — the parent of demi-glace and every classic brown sauce.
Mise en place
Before you start
Brown the mirepoix in the butter over medium-high heat until genuinely browned at the edges, 8–10 minutes.
Add the flour and cook, stirring, until the roux turns the color of peanut butter, 4–5 minutes. Stir in tomato paste for 1 more.
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A brown roux thickens less than a blond one but brings the toasted depth this sauce is named for. Don't let it blacken.
Whisk in hot stock, add bay and thyme, and simmer very gently 60–75 minutes, skimming often, until reduced by a third and glossy.
Strain through a fine sieve, pressing on the vegetables. Season at the end.
Taste before serving and adjust salt and acid — the last 30 seconds of seasoning matter more than any single ingredient.
Afterwards
Keep, reheat & pair
Storage
Airtight jar in the fridge, 3–5 days. Press plastic wrap onto the surface of starch-thickened sauces to stop a skin forming.
Freezing
Most sauces freeze 2–3 months; freeze in ice-cube trays for single portions. Emulsified butter/egg sauces don't freeze — they break on thawing.
Reheating
Reheat gently over low heat, whisking; butter- and egg-based sauces split when boiled. Loosen with a spoonful of warm water or stock.
Make ahead
Most sauces keep 3–5 days refrigerated and freeze in ice-cube trays for instant single portions. Emulsified butter sauces are best made within the hour.
Wine pairing
Follows the dish it dresses.
Beer pairing
Follows the dish it dresses.
On the plate
Serve it with
Sides
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Becomes: demi-glace, bordelaise, chasseur, madeira sauce
Garnish
A final swirl of butter or oil
When it goes sideways
Troubleshooting
Lumps. The liquid went in too fast or too cold. Whisk hard; if lumps persist, pass the finished sauce through a fine sieve — no one will ever know.
Tastes like flour. The roux needed another minute of cooking before the liquid. Simmer the finished sauce 5 extra minutes and the raw edge cooks out.
A skin formed. Press plastic wrap or buttered parchment directly onto the surface while it holds.
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