Gremolata Butter Baked Cod Is a Foolproof Fish Dinner

Prepare the following, adding each to the bowl of butter as it is completed: Mince 3 garlic cloves. Finely grate the zest of 1 medium lemon (about 1 tablespoon). Pick the leaves from 10 fresh parsley sprigs until you have about 1/2 cup, then finely chop (chop more parsley for garnish if desired). Add the remaining 1/2 teaspoon kosher salt and mix until combined.