Châteaubriand Butter

Ingredients

Equipment Needed

• •1-quart (1-liter) heavy saucepan
• •Fine-mesh sieve
• •Heatproof jug or bowl
• •Small whisk

Instructions

1. 1

   Reduce the wine

   Combine the white wine, shallot, thyme, bay leaf, and mushroom parings in a small heavy saucepan. Bring them to a brisk, controlled simmer over medium-high heat and reduce the wine by two-thirds, until about 2 tablespoons plus 2 teaspoons (40 ml) remain. The shallot and mushrooms should sit in a wet, intensely scented glaze, never a dry pan. If the wine slips too far and the shallot begins to catch, add 1 tablespoon of wine or water and reduce again. Ça se rattrape.

   Use the smallest saucepan that holds the ingredients comfortably. A broad pan races through this little quantity and can go from properly reduced to scorched while you reach for the whisk.
2. 2

   Add the veal gravy

   Pour in the veal gravy and stir across the pan floor to gather every trace of the wine reduction. Return the mixture to a lively simmer and reduce the whole by half, to about ⅓ cup (80 ml). It is ready when the bubbles look close and glossy and the liquid lightly naps the back of a spoon, meaning it coats rather than runs off like broth. Complete this reduction now. Once the butter enters, boiling is forbidden.

   If the base becomes sticky or heavily syruped, loosen it with a spoonful of water or veal gravy. Bring it back just to a light coating consistency before continuing.
3. 3

   Pass the sauce

   Set a fine-mesh sieve over a clean heatproof jug and pour in the reduction. Press the shallot and mushroom parings firmly with the back of a spoon to recover their liquid, then discard the solids. This sieve is the honest home equivalent of the tammy: the equipment changes, but the purpose remains a smooth, concentrated base without stray fibers. Rinse and dry the saucepan, then return the strained sauce to it.

4. 4

   Monter au beurre

   Bring the strained base just to the first simmer, then remove the pan completely from the heat and wait about 20 seconds. Monter au beurre means mounting the sauce with butter: whisk in the Butter à la Maître d’Hôtel (No. 150) one piece at a time, adding each new piece when the last is nearly absorbed. Beat steadily until the sauce is thick, glossy, and unified, then fold in the chopped tarragon. If it turns oily or separates, do not return it to the flame. Whisk the cold water in a clean bowl, then add the broken sauce a teaspoon at a time until it gathers; once smooth, whisk in the remainder gradually. Ça se rattrape.

5. 5

   Sauce the beef

   Taste before considering any further seasoning, since the veal gravy and compound butter already carry salt, pepper, lemon, and parsley. Spoon about 2 tablespoons over each grilled fillet of beef, letting the sauce pool naturally beneath it. Serve at once. If dinner pauses, hold the saucepan in barely warm water for no more than 10 minutes and whisk occasionally; direct heat will split what you have just built. À table!

Chef Tips

• •Veal gravy here means a gelatin-rich, unsalted preparation, not flour-thickened packaged brown gravy. A good butcher or prepared-stock maker may sell it frozen; it should set softly when cold and melt cleanly without tasting heavily salted.
• •Mushroom parings are thrift put to work: clean stems, cap trimmings, and sound peelings from mushrooms prepared for the meal. If you have no trimmings, slice one or two ordinary button or cremini mushrooms to the stated weight. The flavor matters, not the shape.
• •Choose a dry, unoaked white wine with firm acidity. Sweet wine makes the reduction cloying, while heavy oak becomes bitter as the liquid concentrates.
• •Two tablespoons per fillet is generous. Serve the beef with pommes château or a restrained green vegetable, and pour a structured red wine beside it. The sauce already has plenty to say.

Advance Preparation

• •The wine and veal-gravy reduction can be completed, strained, cooled, and refrigerated in a covered container for up to 2 days. Reheat it only to the first simmer, remove it from the fire, and complete the butter finish immediately before serving.
• •Do not finish the full sauce hours ahead. Once mounted, it can wait for about 10 minutes in a barely warm water bath, but it should never return to direct heat or a boil.
• •Any chilled leftover will set like compound butter. Rather than forcing it back into an emulsion, slice it over newly grilled beef or hot mushrooms and let their heat melt it.

Frequently Asked Questions

Nutrition Information

1 serving (about 38g)