Heat oven to 350 degrees F. Rinse swordfish steak and pat dry with paper towel. Make sure any skin on the edge of the swordfish slice is removed and the remaining fat is scored.
In a flat baking dish, melt the butter. Stir in the grated peel, lemon juice, and salt. Place the swordfish slice in the dish, turning over once to make sure both sides are coated with the butter mixture. Bake, uncovered, in oven for 30 minutes, or until an internal temperature of 145 degrees F.
from a suggestion on a fish packagehttp://macheads2.net/recipes/SwordfishBakedLemonButter.html