Pulled Pork Sandwiches without beef tenderloin

1 tablespoon vegetable oil 1 (4 pound) pork shoulder roast 1 large onion, thinly sliced 1 (8 ounce) can tomato sauce 2/3 cup cider vinegar 3 tablespoons[...]

1 (4 lb) boneless boston butt or 1 shoulder blade roast, about 4lbs 1 tablespoon cumin seed 2 -3 teaspoons crushed red pepper flakes 1 teaspoon coriander 1[...]

1 tablespoon kosher salt 4 lbs boneless pork shoulder , excess fat trimmed 5 garlic cloves , crushed 1 teaspoon cumin seed 1/2 cup apple cider vinegar ,[...]