Heat 2-3 tbsp of oil in shallow wide pan.
Once hot, saute ginger, garlic, serrano, cilantro stems and white part of scallions for 2-3 minutes or until the raw smell of garlic goes away.
Add ½ cup of water, ¼ tsp of salt and ¼ tsp of black pepper powder to the pan. Bring it to quick boil.
While waiting for the boil, In a bowl mix ¼ cup of water, 1 tbsp of corn starch, 1 tbsp of sriracha sauce, 1 tbsp of rice vinegar, 2 tbsp of soy sauce and 2 tbsp of tomato ketchup. Mix it very so there are no lumps.
Once the water in the pan is boiling, slowly add corn starch mix while stirring constantly.
Keep stirring and cooking the sauce until it thickens and changes color to deep brown.
Add air fried/baked cauliflower, chopped cilantro and chopped scallions to the sauce.
Mix everything well and carefully until all the cauliflower forests are coated with the sauce. Taste and fix the salt and pepper as needed.