Barbecue Pork Sandwich

Ingredients

• 6-8 pounds pork shoulder roast or pork tenderloin
• 4 tablespoons olive oil, divided
• 1 large sweet yellow onion, diced and sautéed
• 1-2 large cloves garlic, chopped fine
• 1/2 cup vinegar (red wine cider or specialty vinegar)
• 1 teaspoon dry mustard
• 1/2 cup Worcestershire sauce
• 2 tablespoons fresh lemon juice
• 1 tablespoon honey ((or 1 teaspoon sugar))
• 1-2 tablespoons tobacco sauce ((or 1 tablespoon Sriracha chili))
• 2 cups water
• 2 cups ketchup
• 1/8 cup Mesquite or Hickory liquid smoke
• 3/4 cup butter
• Salt and pepper to taste when done