Game Day Chipped Ham Barbeque Sandwiches

Ingredients

• 2 cups thinly sliced yellow onion (from 1 large (1 lb.) onion)
• 1-1/2 cups ketchup
• 1/2 cup water
• 2 Tbsp. dark brown sugar
• 2 Tbsp. yellow mustard or spicy brown mustard
• 2 Tbsp. worcestershire sauce
• 2 Tbsp. apple cider vinegar
• 1/2 tsp. black pepper
• 1-1/2 lb. thinly sliced deli ham, roughly torn
• 10 hamburger buns, split and toasted
• 1/2 cup, plus 2 Tbsp. dill or sweet pickle relish
• Reynolds Kitchens® Slow Cooker Liners