Teriyaki Grilled Fish - The Garden Kitchen

Ingredients

• 2 pounds tilapia (or other white fish) filets, cleaned
• 1 medium pineapple, thinly sliced (or 2—15 ounce cans pineapple slices in juice, drained)
• 1 medium red onion, thinly sliced
• ¾ cup prepared teriyaki sauce, divided (see recipe)sesame seeds (optional)