Step 2
Meanwhile, heat 2 tablespoons of the oil in a large pot or Dutch oven over medium-high. Add 3 of the onion quarters, reserving the last quarter for later use, and garlic to pan. Cook, flipping once, until charred, about 6 minutes. Remove from heat (do not wipe out the pot), and transfer onion and garlic to a blender. Add chicken broth, chiles, tomatoes, vinegar, 1 teaspoon salt, cumin, oregano, pepper, and cloves. Secure lid on blender, and remove center piece to allow steam to escape. Place a clean towel over opening. Process until combined, about 1 to 2 minutes. Pour through a fine mesh strainer into a large bowl.