Pork Cecina Tacos - Rick Bayless

Ingredients

• 8 garlic cloves, unpeeled
• 10 medium (about 2 ½ ounces total) dried guajillo chiles, stemmed, seeded and deveined
• 1/2 inch cinnamon stick, preferably Mexican canela (or about ½ teaspoon ground)
• 1 clove (or a pinch ground)
• 10 black peppercorns (or a scant ¼ teaspoon ground)
• 1 1/2 teaspons salt
• 1/4 cup cider vinegar
• 1 1/4 pound piece of lean, boneless pork loin
• Avocado-Tomatillo Salsa (see recipe)
• 1 dozen corn tortillas, warmed