Beef Barbacoa Sliders

Name: Beef Barbacoa Sliders
Prep time: 30 min
Cook time: 3 h
Total time: 3 h 30 min
Cuisine: Mexican
Ingredients: 10 guajillo chiles (stemmed and seeded); 10 ancho chiles (stemmed and seeded); 5 cups water; 1/3 cup apple cider vinegar; 1 medium Roma tomato (quartered); 1/2 medium white onion (coarsely chopped (about 1/2 cup)); 3 medium cloves garlic; 1 tablespoon dried oregano; 1/2 teaspoon ground cinnamon; 1/2 teaspoon ground allspice; 1/2 teaspoon freshly ground black pepper; 5 whole cloves (stems removed); 2 1/2 teaspoons kosher or coarse sea salt; 3 tablespoons safflower or vegetable oil; 4 pounds beef round roast or brisket (cut into 4-inch chunks); 1 pound Banana leaves (or aluminum foil); 12 ounces light beer (1 bottle); 24 small slider buns (brioche or challah buns are specially good with this!); Pickled jalapeños (optional)