Hawaiian Burgers

Serve with napkins, paper towels, and wipes because these Hawaiian burgers are juicy!! They are drippy, messy, good!!
1 lb. ground hamburger
8 potato rolls
teriyaki sauce (see recipe below)
8 small slices mozzarella cheese
red onion, sliced
fresh pineapple slices, roasted or grilled*
8 slices ham
Form 8 small hamburger patties. Grill burgers or fry in skillet over medium/low heat 5-6 minutes per side or until browned. Salt and pepper meat while cooking. Layer sauce, hamburger patties, cheese, onion, pineapple and ham on rolls.
*To grill pineapple, preheat the grill. Oil grill rack as pineapple likes to stick. Grill pineapple over medium heat (with lid closed) four minutes each side. Baste with 1/2 cup melted butter + 2 tablespoons sugar several times while cooking, if desired.
Teriyaki Sauce:
2½ T soy sauce
3½ T ketchup
2 T sugar
In a small saucepan, combine ingredients. Warm over medium/low heat until sugar is dissolved.