Wash all the vegetables, then clean the guajillos cut the backs and fronts of the chilies, the take out the seeds, if you don't want the sauce to be very hot or take out the seeds of some of the chilies. put the chilies to boil with a dash of sea salt. Meanwhile in a mexican comal or stovetop grill, burn and grill the onion, garlic cloves and tomatoes. When the chilies are tender put the with their boling water in to a mortar or mexican molcajete or a blender, smash them a little bit, then add the rest of the vegetables and keep shashing them up until thay are all chunky crushed and blended, then check salt to taste, and serv, adding on top a dash of crushed fresh cilantro and onion if you want. This sauce is great on all grilled poultry, meats, quesadillas, tacos and delicious with fried eggs ranchero style. Mmmmm yummy.