Bora Bora Burgers With Potato Nuggets

• 4 hamburger buns
• 4 lettuce leaves
• 1 potato nuggets (frozen)
• 450 gr beef (lean ground)
• 180 ml ketchup
• 50 ml prepared teriyaki sauce
• 2 gr ginger (ground)
• 1 gr pepper flakes (red)
• 4 slices pineapple (sliced canned)
• 4 slices onion (sliced red)