These grilled teriyaki mushroom meatball sandwiches are made with half beef and half mushrooms, with teriyaki sauce, veggies, and pineapple on a toasted bun.
Mix Teriyaki Sauce ingredients in a small bowl and whisk together. Set aside.
In a food processor, add two cloves of garlic and mince. Add mushrooms and process until finely minced.
In a large bowl add hamburger, mushroom/garlic mixture, sesame oil, bread crumbs, egg, green onions, garlic and ¼ cup of the teriyaki sauce. Use your hands to blend the mixture together until well combined.
Using a 2-inch ice cream scoop, scoop out the mushroom meatball mixture and work them into balls. Place on a platter one at a time, until all of the mixture is used up. (Note: This mixture should make 12 mushroom meatballs. Make the mushroom meatballs as equal in size as possible to ensure they cook in the same amount of time.)
Thread meatballs, mushroom halves, and red onions onto the skewers alternating, until the skewers are filled up.
Reserve an additional ¼ cup of the teriyaki sauce and use the rest to baste the meatballs, veggies, and pineapple whiling grilling.
Build a hot fire in a charcoal grill or preheat a gas grill to high. Arrange the skewers on the grill rack without crowding. Place pineapple rings on the grill. Use tongs to help turn the skewers and pineapple slices. Baste each skewer and pineapple slice with teriyaki sauce and continue to grill until browned evenly on all sides and cooked to medium, 8 to 10 minutes total, depending on grill temperature. Move any skewers to a cooler area of the grill if they threaten to over-brown. Transfer to a platter when finished. Let rest for 5 minutes while you assemble the sandwiches.
Cut the hoagie rolls in half with a bread knife and grill for about two minutes, depending on how hot the grill still is after the meatballs are done.
Spread mayonnaise on each side of the bread and sprinkle with drops of sriracha sauce, if desired.
Add mushroom meatballs and top with grilled mushrooms, onions, pineapple, cabbage, carrots, and bean sprouts. Drizzle some of the reserved teriyaki sauce on top and prepare for a wonderful flavor explosive sandwich.
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