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Toast the shrimp shells in a large saucepan over medium heat with unsalted butter until lightly toasted. Add vegetable trim from dicing thyme, bay leaf, whole black peppercorns and cook until a nicely browned base, 4-5 minutes. Add white wine to deglaze the pan, add lemon and low-sodium chicken stock. Simmer 15 - 20 minutes until flavorful, strain and reserve for creole. (Be careful adding salt to this stock, seafood tends to create saltier stocks so refrain from adding additional salt).