Preheat the grill to medium-high heat. Cut heavy-duty aluminum foil into 4 large pieces, large enough to wrap around the meatballs and veggies.
Divide the 32 frozen meatballs by placing 8 meatballs in the center of each sheet of aluminum foil. Divide 1 (20-ounce) canned pineapple chunks, 1 chopped red bell pepper, 1 chopped orange bell pepper, and 1 small sliced red onion evenly into each packet.
Prepare 1 cup Homemade Teriyaki Sauce or use your favorite store-bought sauce. Drizzle ¼ cup of the sauce on top of each meatball and veggie mixture.
Fold and seal the packets. Bring the two longer sides of the foil together and seal tightly. Next fold in the shorter edges of the foil, making sure there are no openings or gaps.
Place the packets onto the hot grill and cook for 15-20 minutes or until the meatballs are warmed through. To serve, carefully open packets and garnish with green onions and sesame seeds. Serve over cooked rice, if desired!
Notes
Storage: Teriyaki Meatball Foil Packets are best served fresh, but leftovers can be stored in the fridge for up to 3 days. Reheat at 350ºF in the oven or pop them in the air fryer to crisp up!