Preheat your grill to high heat and your oven to 400°F.
Remove the membrane from the back of each rack of ribs.
Mix brown sugar, salt, paprika, chili powder, garlic powder, onion powder, cumin, cayenne pepper, and black pepper.
Rub this mixture generously over both sides of the ribs.
Place ribs in a large resealable bag or a non-reactive container.
Pour vinegar and water over the ribs and seal or cover tightly.
Let them marinate in the fridge for at least 2 hours or overnight for stronger flavor.
Remove ribs from the marinade, and wrap each rack in aluminum foil.
Place the wrapped ribs on a baking sheet.
Bake in the oven for 1.5 hours.
Finish the ribs on the high-heat grill for about 10 minutes, turning occasionally.
You're looking for a good char on the outside.