Thaw fish, if frozen. Rinse fish; pat dry with paper towels. Measure the thickness of the fish. Arrange fish in a shallow 2-quart baking dish. Bake, uncovered, in a 450 degree F oven until fish just flakes easily with a fork (allow 6 to 9 minutes per 1/2-inch thickness). Drain excess liquid from fish.
Meanwhile, in a small bowl stir together the salsa and honey. Spread mustard over drained fish, then spoon salsa mixture atop mustard; bake for 2 to 3 minutes more or until mustard and salsa mixture are hot. Makes 4 servings.