Pineapple Teriyaki Burgers

INGREDIENTS

• cooking spray
• 2 slices canned pineapple, drained
• 3/4 pound ground beef
• 1/2 cup plain bread crumbs
• 1/2 (8 ounce) can sliced water chestnuts, drained and chopped
• 1/4 cup teriyaki sauce
• 1 egg
• 1 (1 inch) piece fresh ginger, minced
• 1 1/2 teaspoons Asian seasoning blend
• 1/2 teaspoon onion powder
• 1/4 teaspoon garlic powder
• 1/2 cup shredded lettuce, divided
• 2 hamburger buns, split