Lobster, crab and shrimp are crustaceans, and the hard outer coverings we casually call shells are more precisely carapaces. Whatever the name, they are valuable kitchen material: they carry the savory character of the animal and make a generous foundation for broth.
After a shellfish meal, collect the cleaned shells, legs, claws, tail pieces and bodies in a large pot. They have already been paid for; giving them a second purpose is one of the simplest ways to deepen flavor while wasting less.
Keep the broth simple.
Shells, cold water and time are enough. Salt and aromatics can be added later, when you know how the broth will be used.
Make a shellfish broth
Place the shells in a pot and cover them with cold water by about two inches. Bring the water to a boil over high heat, then lower the heat and simmer gently for one to three hours. For a shorter version, simmer for about an hour and replace a little water if the level drops too far.
Strain the liquid through a fine sieve and discard the shells. Let the broth cool, then portion it into labeled containers and refrigerate for up to a few days or freeze until needed. Leave room at the top of each container for expansion.
Put it to work
This broth can become the base of a quick bisque, a sauce for seafood or the cooking liquid for a plate of pasta. Its most useful quality is flexibility: use a little to loosen a sauce, or let pasta absorb it gradually for a more concentrated result.
Linguine with shrimp and shellfish broth
- Warm olive oil with two crushed garlic cloves; remove the garlic once lightly golden.
- Cook finely chopped onion until translucent.
- Add partially cooked linguine, shelled shrimp, chili flakes and parsley.
- Toss with about two cups of shellfish broth, adding more until the pasta is al dente.
- Finish with black pepper and serve immediately.
Fresh broth brings a clean seafood note to the dish without requiring a long list of ingredients. The same method works with crab, crawfish or shrimp shells, making it a useful habit whenever shellfish reaches the table.
Kitchen note: Shellfish should be handled promptly and kept cold. Cool cooked broth quickly before storing, and reheat it thoroughly before serving.