Make sure the fish is completely thawed and patted dry before seasoning to prevent sticking on the grill. Use a fish spatula for easy flipping to keep the fillets intact. If you don’t have a grill, a grill pan or broiler works great as an alternative. Adjust the amount of lemon juice to your taste; some prefer more tang, others a milder citrus note. For a richer sauce, you can substitute part of the Greek yogurt with light cream cheese, but keep it balanced with lemon juice. Let the grilled fish rest for a minute or two before serving to allow the juices to redistribute.