Sizzling Burgers with Sweet and Sour Sauce

Ingredients

• 1 can (8 oz each) La Choy® Sliced Water Chestnuts, drained and finely chopped
• 6 tablespoons sliced green onions, divided
• 1/4 teaspoon garlic powder
• 4 hamburger buns with sesame seeds, split and toasted
• 3 tablespoons La Choy® Sweet and Sour Sauce
• 1/4 teaspoon ground black pepper
• PAM® Grilling Spray
• Lettuce leaves, tomato slices or pineapple slices, optional
• 1 pound ground round beef (85% lean)
• 1/4 cup mayonnaise
• 2 tablespoons La Choy® Soy Sauce