Mustard Bbq Pulled Pork

Name: Mustard Bbq Pulled Pork
Ingredients: 1 1/2 tablespoons dry mustard; 1 cup cider vinegar; 1 cup granulated sugar; 1 cup water; 1 tablespoon crushed red chili flakes; 1 tablespoon honey; 1 tablespoon Worcestershire sauce; 1 teaspoon onion powder; 1/2 teaspoon cayenne pepper; 1/2 teaspoon garlic powder; 1/2 teaspoon turmeric; 1/4 cup lemon juice; 2 1/2 cups chopped white onions; 2 tablespoons minced garlic; 2 tablespoons unsalted butter; 2 tablespoons yellow mustard seeds; 5 pounds pork shoulder, cut into 2 inch cubes; Salt and pepper