Heat sesame oil in a large skillet or wok over medium-high heat. Add ground pork and let sit 1–2 minutes before breaking up. Cook 5–6 minutes until browned through. Drain most fat, leaving about 1 tablespoon.
Push pork to one side. Add onion to empty side; cook 2 minutes. Add garlic and ginger; stir everything together and cook 30–60 seconds until fragrant.
Add coleslaw mix and toss to combine. Cook 3–4 minutes, stirring occasionally, until cabbage is just wilted but still has texture.
Pour in soy sauce, rice vinegar, hoisin, and chili garlic sauce. Toss to coat and cook 1 minute. Remove from heat and drizzle toasted sesame oil over the top. Taste and adjust seasoning.
Divide into bowls. Top with green onions, sesame seeds, and sriracha mayo. Serve as-is or over rice.