Experience the classic taste of Pittsburgh with these saucy, sweet, and tangy ham sandwiches. The secret lies in chipped chopped ham, a deli specialty in this Steel City town.
Preheat the oven to 275°F (135°C).
In a large skillet, melt the butter over medium-high heat. Cook and stir the onion until it turns translucent, about 5 minutes. Add ketchup, vinegar, water, brown sugar, mustard, Worcestershire sauce to the skillet. Let it simmer for around 10 minutes. Incorporate ham.
Cook until the sauce bubbles and the ham is heated through, which should take about 5 to 7 minutes more.
Meanwhile, heat kaiser rolls in the preheated oven until they're toasted, approximately 5 to 7 minutes.
Once the ham is cooked and the rolls are toasted, assemble the sandwiches by adding the ham mixture to the bottom half of each roll. Top with pickle relish and serve hot.
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