4 tablespoons unsalted butter
4 garlic cloves, finely grated or minced
1 ½ tablespoons minced thyme leaves
1 ½ teaspoon curry powder
1 ½ teaspoon grated ginger
¼ teaspoon fine sea salt, more as needed
¾ teaspoon finely grated lemon zest
Ground black pepper, to taste
4 (6-ounce) blackfish, flounder or hake fillets
Fresh lemon juice, for serving
Dill fronds or fresh parsley, for serving