You can also make this in a slow cooker. To do so, add everything but the onions to the pot, stir to coat the chicken evenly and cook on low for 6 hours. To finish the dish, transfer the chicken to a foil lined sheet and drain the sauce into a small saucepan. Broil the chicken until well browned and reduce the sauce the saucepan. (The sauce can take from 10-20 minutes, or you can add a pinch of glucomann powder to help thicken it.) Brush the chicken with the sauce and broil another 5 minutes. Serve with remaining sauce.