Purée d’Oseille et de Vermicelle à la Crème

Purée d’Oseille et de Vermicelle à la Crème (sorrel and vermicelli cream soup) teaches the rule every liaison-bound potage obeys: once the egg yolks and cream enter, the boil is finished. Vermicelli gives the soup its quiet body, butter-softened sorrel gives it a clean green acidity, and the liaison (egg-and-cream binding) brings the two together without making the soup taste of egg. It should pour like thin cream, never sit like porridge.

The original entry assumed a cloth tammy, a saucier able to pass the purée and finish it at the instant of service, and either milk or a white consommé from a stockpot never off the fire. This version follows the entry’s milk preparation, fixes its open-ended quantity at a home pot of about two quarts, and replaces the tammy with an immersion blender followed by a fine-mesh sieve. The separate service pots and cloth sieve are brigade scaffolding. The gentle milk poach, sorrel cooked in real butter, fine passing, and last-minute liaison are the dish itself, so they stay. One cook, one stove, one evening.

When it is right, the purée is pale green and glossy, with enough sorrel to wake the cream but not bully it. Bring the strained base to its first boil, remove it completely from the heat, then temper the liaison into it. That is the step that decides the soup.