Cheese Steak Pockets

4 sheets (12x18-inches each) foil
1 pound boneless beef sirloin steak, 1/2-inch thick
Salt and pepper
2 medium onions, thinly sliced
1 cup shredded Cheddar cheese
4 sub or hoagie-style buns
Ketchup or steak sauce

Preheat grill to medium-high. Spray foil with nonstick cooking spray. Cut steak lengthwise in half and then crosswise into 1/8-inch thick strips.
Sprinkle steak strips with salt and pepper; set aside. Center one-fourth ofonions on each sheet of foil. Top with steak strips and cheese. Bring up foil sides. Double fold top and ends to seal packet, leaving room for heat circulation inside. Repeat to make four packets.
Grill 8 to 10 minutes in covered grill. Serve on sliced buns with additional cheese, if desired. Top with ketchup or steak sauce.
Number of Servings: 4