Manchego cheese and salsa go well with this hearty quesadilla filling.
Place a medium saute pan over medium heat, and add oil. When hot, add chorizo, and cook until nicely browned on both sides, about 5 minutes.
Transfer chorizo to a plate lined with paper towels to drain. Add onion to pan, and cook until beginning to brown, about 5 minutes. Add 3/4 cup water, and simmer until tender, about 10 minutes.