Ingredients

• 1/2 cup butter
• 1 small onion, finely chopped
• 2 cups ketchup
• 1/3 cup distilled white vinegar
• 1/2 cup water
• 3 tablespoons brown sugar
• 2 teaspoons prepared yellow mustard
• 2 tablespoons Worcestershire sauce
• 1 1/2 pounds chipped chopped ham
• 8 kaiser rolls, split
• 1 cup pickle relish (optional)

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Instructions

1. Preheat an oven to 275 degrees F (135 degrees C).
2. 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.
3. While the ham simmers, heat the kaiser rolls in the preheated oven until toasted, 5 to 7 minutes.
4. Assemble the sandwiches by dividing the ham mixture among the toasted kaiser rolls, topping the ham with pickle relish. Serve hot.