4-6 cups shellfish shells, from shrimp, lobster, and/or crab
1/2 cup dry white wine
1 large yellow onion, sliced or chopped
1 carrot, roughly sliced or chopped
1 celery stalk, roughly sliced or chopped
2 Tbsp tomato paste
2 sprigs of thyme
Several sprigs parsley
1 bay leaf
10-15 whole peppercorns
2 teaspoons salt