Ingredients:
½ cup butter
1 small onion, finely chopped
2 cups ketchup
⅓ cup distilled white vinegar
½ cup water
3 tablespoons brown sugar
2 teaspoons prepared yellow mustard
2 tablespoons Worcestershire sauce
1 ½ pounds chipped chopped ham
8 kaiser rolls, split
1 cup pickle relish
Directions:
Preheat an oven to 275 degrees F (135 degrees C).
Melt the butter in a large skillet over medium-high heat; cook and stir the onions in the butter until translucent, about 5 minutes. Stir the ketchup, vinegar, water, brown sugar, mustard, and Worcestershire sauce into the skillet with the onions; simmer about 10 minutes. Stir in the ham; cook until heated through and the sauce is bubbling, 5 to 7 minutes more.
While the ham simmers, heat the kaiser rolls in the preheated oven until toasted, 5 to 7 minutes.
Assemble the sandwiches by dividing the ham mixture among the toasted kaiser rolls, topping the ham with pickle relish. Serve hot.