Poularde au Vert-pré

Poularde au Vert-pré (poached pullet with a spring-green sauce) teaches the last restraint of sauce-making: once Printanier Butter (No. 157) turns the sauce suprême green, heat becomes the enemy. The butter goes in off the heat, in small pieces, and the sauce never returns to a boil. That is the one true thing to know before touching a pan.

The book's entry assumed a saucier on staff, a stock never off the fire, a poaching vessel scaled for service, and a tammy already used to prepare the vegetable butter. At home, one snug stockpot poaches one young chicken; its clear liquor becomes the foundation of the sauce, a fine-mesh sieve handles the straining, and the finished Printanier Butter (No. 157) remains the separate canonical component the book intended. The bulk stockpot and brigade handoffs are scaffolding, so they go. The gentle poach, true sauce suprême, exact two ounces of green butter to one pint of sauce, and separately cooked spring vegetables are the dish, so they stay. One cook, one stove, one evening.

The finished poularde is pale and tender beneath a glossy, faintly green coat, with peas, French beans, and asparagus tips gathered around it in butter. Hold the poaching liquid at a tremble, never a boil, then take the sauce completely off the heat before the first piece of green butter goes in. Keep those two moments calm and the dish will give you everything it promises.