Juicy Hawaiian Burger with Pineapple and Teriyaki - Yummy Gusto

Ingredients

• 450 g ground beef (80/20 lean-to-fat ratio)
• 1 tablespoon soy sauce
• 2 tablespoons teriyaki sauce
• 1/4 teaspoon ground ginger
• 1 teaspoon garlic salt
• 1 can sliced pineapple, drained
• 1 large red onion, sliced into 1.25 cm thick rings
• 4 slices mozzarella cheese
• 4 burger buns
• Additional teriyaki sauce, for drizzling