If you prefer your stock homemade, you can try your hand at making your own seafood stock using the shells from your shrimp. Throw the shrimp shells in a stockpot with 2 tablespoons of olive oil over medium heat. Add in 2 cups of onions, 2 cups peeled and chopped carrots, a few chopped celery stalks, and 2 garlic cloves. Then, add ½ cup white wine, 2 tablespoons tomato paste, and 2 ½ quarts of water. Finally, add a few sprigs of thyme, and 2 teaspoons each salt & pepper. Throw in a bay leaf (remember to remove it later) and boil for an hour. There you have it!