In a medium bowl, mix the tamarind pulp, sugar, soy sauce, red chili powder, cumin, salt, black pepper and vinegar.
Heat up oil in a sauce pan. Once warm, add the garlic, ginger to the hot oil and saute for 10-15 seconds, don't let burn.
Add the tamarind pulp mix all at once to the pan. Add 2-3 tablespoon water and mix well. Cook down on low medium heat for 10-12 minutes till its thickish. The sauce wil be runny in the beginning but slowly thicken.
Once the sauce is ready, cool down and set aside.
Prepare the Wings for Baking/Air Frying
Place the chicken in a bowl and add 2-3 tablespoon of the tamarind sauce along with salt and baking powder. Using clean hands, toss and mix to coat all the wings properly.
To Air Fry -Preheat your air fryer at 375 F. Layer the wings in a single layer in the basket. Make sure that the wings are not touching each other. You might have to work in batches.
Air fry for 16-18 minutes, flipping using tongs half way at 8-10 minutes.
To Bake - Preheat oven to 400F. Line a sheet pan with foil and place a oven proof rack on top of the foil. Spray the rack liberally wiuth cooking spray.
Arrange the wings in a single layer on the rack.
Bake for 40 minutes, flipping using tongs at half the time until the wings are crispy and slightly charred on the edges.
Serve the wings warm with rest of the tamarind sauce.
Notes
Just soak and squeeze the pulp of the sweet tamarind pods like regular tamarind.