How to Make It
Preheat grill to medium-high heat.
Coat 4 (12-inch-square) pieces of foil with cooking spray; place 1 fillet in center of each piece. Top each fillet with 1 1/2 teaspoons butter and 1 tablespoon dill. Top evenly with salt, pepper, and orange slices. Bring edges of foil up over fillets; fold to seal. Place packets, seal side up, on grill; cover and grill 12 minutes or until desired degree of doneness. Remove foil packets from grill.
Combine oil and asparagus in a bowl; toss. Place asparagus on grill; grill 5 minutes or until crisp-tender, turning once after 3 minutes. Divide asparagus evenly among 4 plates. Open packets; top asparagus with fillets. Squeeze orange slices evenly over fillets.