Mustard Sauce: 6 tablespoons (3/4 stick) butter, melted 3 tablespoons fresh lemon juice 2 tablespoons Dijon mustard For swordfish: Prepare barbecue grill with very hot coals. Pat fish dry. Brush with lemon juice. Spread 1 side with mustard. Dot with butter. Grill fish mustard side up until just opaque, about 20 minutes; do not turn. For sauce: Heat butter, lemon juice and mustard in heavy small saucepan. Arrange fish mustard side down on plates. Spoon sauce over and serve. fish 24