Giddy Swamp SC Hash

INGREDIENTS

• 2 pounds onions peeled and chopped coarsley
• 1 cup cider vinegar
• 5 pounds Pork shoulder/Boston butt
• 9 ounces yellow mustard
• 1 pound potatoes peeled and cut into small dice
• 2 tablespoons black pepper
• 1 teaspoon red pepper flakes
• water to cover
• 1 tablespoon salt