Preheat oven to 425º
Trim wings of excess fat using a sharp knife. Place into a bowl and toss with salt and pepper.
Put wings on a sheet pan in a single layer and bake 45 minutes until brown and crisp.
Meanwhile, melt butter in a saucepan and add ginger and garlic. Saute until fragrant then add all other sauce ingredients except scallions and sesame seeds. Bring to a medium boil then cook until reduced and thickened (3-5 minutes). You will end up with about 2/3 cup. Keep warm.
Toss hot wings with 3/4 of sauce then return to oven for another 5 minutes. Remove from oven, place wings into a bowl and toss with remaining sauce. Garnish with scallions and sesame seeds.