01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, combine ground meat, egg, breadcrumbs, minced garlic, chopped spring onions, soy sauce, salt, and pepper. Mix gently until just incorporated.
03 - Form mixture into 20 to 24 small, uniform meatballs and place them evenly spaced on the prepared baking sheet.
04 - Bake in the preheated oven for 12 to 15 minutes until the meatballs are cooked through and nicely browned.
05 - While meatballs are baking, combine hot sauce, brown sugar, honey, apple cider vinegar, soy sauce, and sriracha in a saucepan over medium heat. Stir until the sugar dissolves and bring to a simmer.
06 - Lower the heat and add butter to the sauce. Stir continuously until butter melts and sauce becomes glossy.
07 - Transfer baked meatballs to a large bowl, pour the hot firecracker sauce over them, and toss gently to evenly coat.
08 - Arrange meatballs on a platter and top with sesame seeds and sliced spring onions. Serve immediately.