Put the chicken pieces into a saute pan in one layer. Add the whole garlic cloves, onion, and 1 cup chicken broth and cook, covered, over medium heat, turning the pieces over from time to time, until the broth has completely reduced and the chicken is tender - about 25 minutes. Crush the minced garlic into a mortar with the oregano, 2 tablespoons broth, and salt and work to a rough paste (or put it all into a blender jar and blend very briefly). Spread the paste over the chicken pieces, turning them so they ar evenly covered; return to the pan and cover. Set aside to season for 2 hours. Heat a broiler or grill and brown lightly, brushing with a little melted chicken fat if necessary. The Art of Mexican Cooking From the collection of Jim Vorheis