Spray a medium skillet with nonstick cooking spray. Add bell pepper and onion; cook over medium-high heat for 2 minutes. Add lamb and garlic salt and cook until brown, stirring to crumble. Drain well. Preheat oven to 400°.
In bowl mix together barbecue sauce and cayenne pepper. Add 1 cup barbecue sauce mixture to cooked lamb. Spread 2 tablespoons remaining barbecue sauce on each pita bread. Top each pita bread with 4 pieces pineapple and 1/2 cup lamb mixture. Sprinkle each pita with 2 tablespoons cheese. Bake in oven until topping is hot and cheese is melted. Cut each pizza into 4 or 8 wedges. Servings: 8 entree.