1-1/2 tsp. zest and 1/4 cup juice from 2 lemons
4 ancho chiles, stemmed, seeded and hydrated
6 chicken leg quarters (3 lb.), separated
1-1/2 lb. sweet potatoes (about 3), peeled, each cut into 12 wedges
1 large sweet onion, cut into wedges
1/4 cup chopped fresh cilantro