Avocado Quesadillas

This simple but surprisingly tasty quesadilla is easy to make at the last minute, then cut into wedges to serve with drinks. Try to look for avocados that are ripe but still firm. A little chopped epazote—a rather pungent Mexican herb, found in Latino groceries (or easily grown)—adds an authentic flavor to the Onion Relish and the Spicy Pickled Vegetables. In Mexico, epazote is traditionally used for cooking beans as well.