Pulled Pork Recipe

Name: Pulled Pork Recipe
Ingredients: 1 tablespoon extra-virgin olive oil; 2 medium yellow onions, diced; 2 tablespoons chili powder; 1 tablespoon cumin; 2 teaspoons paprika; 1 teaspoon cayenne pepper; 12 ounces beer, preferably lager (1 1/2 cups); 3/4 cup ketchup; 3/4 cup cider vinegar; 1/2 cup whole-grain mustard; 2 tablespoons tomato paste (see ingredient notes); 1 canned chipotle pepper in adobo sauce, minced, plus 1 tablespoon adobo sauce; 1 5-pound bone-in boston butt (see ingredient notes)