Preheat oven to Broil.
Sprinkle swordfish steaks with salt and pepper on both sides, then brush both sides with mustard.
Cover bottom of baking dish with melted butter; place steaks in dish and broil 4 to 5 minutes.
Turn steaks and broil 4 to 5 minutes more.
Do not overcook or fish will become dry.
Cut steaks in half, sprinkle with fresh dill, and serve.