01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine ground meat, egg, breadcrumbs, minced garlic, chopped spring onions, soy sauce, salt, and black pepper. Gently mix until just incorporated to maintain tenderness.
03 - Form the mixture into 20 to 24 small, uniform meatballs and arrange them on the prepared baking sheet.
04 - Bake meatballs for 12 to 15 minutes, or until thoroughly cooked and evenly browned.
05 - While meatballs bake, add hot sauce, brown sugar, honey, apple cider vinegar, soy sauce, and sriracha to a saucepan over medium heat. Bring to a gentle simmer, whisking until sugars are fully dissolved.
06 - Lower heat and stir in unsalted butter until melted and the sauce appears glossy and smooth.
07 - Transfer freshly baked meatballs to a large bowl, pour hot firecracker sauce over and gently toss to ensure every meatball is evenly coated.
08 - Plate meatballs immediately, finishing with sesame seeds and sliced spring onions as garnish.