To a blender, add the chiles, the other ¼ onion, 2 raw garlic cloves, oregano, peppercorns, cumin, ground cilantro, bullion, white vinegar. Plus 3 to 4 large cooking spoons of the meat juice or as much needed to blend the chiles.
1 teaspoon Mexican oregano, 10 whole peppercorns, ½ teaspoon ground cumin, ½ teaspoon ground cilantro, 1 Tablespoon powder chicken bullion, ¼ cup apple or white vinegar