Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           unsalted butter -- (1/2 stick), room
                        -- temperature
   2      tablespoons   Dijon mustard
   2      tablespoons   fresh basil -- finely chopped
                        vegetable oil
   4      8 oz          swordfish steaks -- 3/4" thick
                        fresh basil sprigs

Preparation:

Mix first 3 ingredients in a small bowl. Prepare barbecue or preheat broiler. Brush grill with vegetable oil. Season fish with salt and pepper. Grill fish just until cooked through, about 3 minutes per side. Transfer to plates. Top each with spoonful of mustard-basil butter. Garnish with basil sprigs and serve.