Caviare Butter

Beurre de caviar (caviare butter) teaches the discipline of a beurre composé, a compound butter: the butter is not padding, it is the carrier. Keep it cool enough to hold a matte body and pliable enough to accept the roe, and the salt-brine of pressed caviare travels through every bite. Warm butter turns greasy; hard butter leaves streaks. Temperature is the one true thing to settle before you begin.

The book's formula assumed a mortar, a fine sieve, and an extra pair of brigade hands; it needed no saucier, stock never off the fire, or salamander. At home, a shallow bowl with a rigid spoon does the pounding, and a small stainless-steel sieve does the passing. The source's three-to-four ratio by weight remains exact, and its seven-ounce batch is already right for eight appetizer portions, so I have not reduced it. The spare hands are scaffolding. Pounding and sieving are the dish.

The finished beurre de caviar should be pale slate, dense but satin-smooth, with no separate streaks of yellow butter or dark roe. If it goes shiny while you work, chill it briefly and continue. Ça se rattrape. Before the caviare leaves the cold, press the butter with a thumb: it must yield cleanly without looking oily.