Sauce Cardinal — Lobster Butter and Truffle Velouté

Cardinal is fish velouté enriched with lobster butter, truffle, and cream — named for the vivid red of a cardinal's robes, which the lobster butter imparts to the ivory sauce. It sits at the intersection of luxury and technique: every element must be executed precisely, because the sauce has nowhere to hide. The base is a fish velouté made from fumet de poisson and a blonde roux, simmered and skimmed for 20 minutes. To this, add 100ml of lobster cooking liquor (the concentrated broth from boiling or steaming lobster shells) and reduce by one-third. The defining ingredient is beurre de homard — lobster butter. Prepare it identically to crayfish butter for Nantua: pound crushed lobster shells (head, claws, walking legs) with an equal weight of softened butter, melt gently with water, strain, and chill. The solidified disc of coral-red butter carries astaxanthin pigment and concentrated crustacean flavour. Off heat, whisk 60-80g of lobster butter into the velouté in small pieces. Add 50ml of heavy cream. Add 1 tablespoon of truffle brunoise (black truffle, cut into 2mm dice). The truffle is not decoration — its earthy, musky depth provides a bass note against the lobster's high, sweet treble. Strain through a fine chinois (the truffle pieces will be caught — press them through or reserve and add back). The finished Cardinal should be the colour of a faded rose — coral-pink with depth, not the bright orange of a poorly made bisque. It should taste of lobster first, cream second, and truffle as an afterthought that lingers. The classical application is lobster Cardinal: lobster tail meat napped with the sauce, topped with grated Parmesan, and gratinéed under a salamander.