Bisque

What makes a bisque

A bisque is defined not by the shellfish in it but by the technique: the shells are roasted until charred at the edges, then simmered in stock for an hour or more to extract their flavour and colour. The resulting stock is deep orange-red before a roux and cream are added. A genuine bisque is strained completely smooth — no shells, no chunks.

The cognac flambé

Bisque recipes almost always call for deglazing with cognac or sherry after sautéeing the aromatics. Some chefs flambé the spirits — igniting them briefly — to burn off the alcohol while keeping the flavour. The resulting sweetness and colour carry through to the finished soup.

Shell-based stock

The shells of lobster, crab, crayfish, or shrimp contain chitin and pigment compounds that give bisque its distinctive colour and flavour. Wasting them would be the sin. The meat itself is cooked separately and added as a garnish so it remains tender.

Modern variations

Contemporary menus often list “tomato bisque” or “roasted pepper bisque” — borrowings of the smooth, cream-enriched technique applied to vegetables. Purists point out this is technically a cream soup, not a true bisque, which requires shellfish.