In a small mixing bowl, stir together mayonnaise, mustard, lemon juice, and dill weed. Brush sauce on one side of meat ... grill. Pass remaining sauce.
Melt butter in small saucepan on low heat; add lemon juice. Spray broiler pan with ... is smooth, add dill weed. Cover pan to keep sauce warm. Serve sauce over fillets. Makes 2 servings.