large shrimp, peeled, deveined • scallops • fresh lump crabmeat (should be 1/2 lb or 8 oz • unsalted butter • carrots, peeled and medium diced (this is about 4 carrots) • medium diced yellow onion (1 medium size onion) • celery, medium diced (about 3 stalks) • small white or red potatoes, medium diced • corn kernels (maybe one to two ears) • all purpose flour • seafood stock (Ina Garten makes this from shrimp shells, onions, carrots, and celery but I prefer to buy stock at the store) • heavy cream •