01 - Set oven temperature to 425°F. Prepare a baking sheet lined with parchment paper.
02 - In a mixing bowl, gently combine ground meat, egg, breadcrumbs, minced garlic, finely chopped spring onions, soy sauce, salt, and black pepper. Mix until just incorporated, being careful not to overwork the mixture.
03 - Form the mixture into 20 to 24 evenly sized meatballs and arrange on the prepared baking sheet.
04 - Bake meatballs in the oven for 12 to 15 minutes, or until they are cooked through and evenly 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. Bring to a gentle simmer, whisking until the sugar has fully dissolved.
06 - Reduce the heat to low and stir in the butter until fully melted and the sauce is glossy.
07 - Transfer baked meatballs to a large bowl. Pour hot firecracker sauce over them and toss until evenly coated.
08 - Plate meatballs immediately, garnished with sesame seeds and sliced spring onions.