Sorrel’s sour flavor lends itself to use brightening cream soups and other rich dishes. Raw, it can add considerable bite to salads. When cooked in butter, however, it becomes more mild and is a great choice for sauces (try using it in pesto as a basil-substitute for an interesting twist) or inclusion in omelets.
When looking for foods to cook with fresh sorrel, consider lamb, pork, salmon, veal (particularly veal sweetbreads), goose, potatoes, or eggs. Sorrel pairs well with other herbs like tarragon, chervil, lemon thyme, and lemon verbena.
Note: Because sorrel is so acidic, it can impart undesirable flavors and colors to your food if cooked in cast iron or aluminum cookware.