The definition of what makes a bisque has changed a little over the years. Original recipes were seafood only, with the cream typically added early on in the process and used as a thickener, rather than being swirled through at the end. These recipes often incorporated an extra thickening agent made from a paste of ground up shells. These days, however, rice is more commonly used for thickening, and the name ‘bisque’ is often used in a broader sense to describe any thick, smooth soup that is made with cream added either during or after cooking.
Difference between soup and bisque
In fact, a bisque is a type of soup, so all bisque is soup, but not all soups are bisque. If you make bisque the old-fashioned way, the key difference is the way in which cream is used in the dish. Traditional recipes used much more cream than regular soups - even more than cream soups like cream of mushroom or cream of tomato - and the cream was added much earlier in the cooking process, to be used as a thickening agent, where regular soup recipes added it at the very end.
The bisque has evolved somewhat over the years, however, and many modern recipes now add the cream at the end, just like a regular soup. The term ‘bisque’ tends to be used in a looser and more general sense these days, which can make it a little tricky to define. Broadly speaking, however, it refers to a thick soup, with a base made from blended ingredients, an extremely smooth texture and lots of cream.
Ingredients to make bisque
The main ingredient of a bisque is usually a shellfish like lobster, crab, shrimp, or crayfish, but occasionally other ingredients such as tomato, pumpkin or chicken are used. Aromatic vegetables like celery, onion and carrot are typically used alongside the main ingredient to make a flavourful base, and the dish is well-seasoned, using various herbs and spices.