Ingredients
- 2 tablespoons olive oil
- 4 large onions, sliced ¼ inch thick
- 3 large red and/or green bell peppers, seeds removed, sliced ¼ inch thick
- Kosher salt, freshly ground pepper
- 3 tablespoons white or red wine vinegar
- 4 pounds boneless beef short ribs
- 8 10-inch-long Italian sub rolls
- Vegetable oil (for griddle)
- Kosher salt
- Freshly ground pepper
- 10 ounces white or yellow American cheese slices (about 16)
- 10 ounces mild or sharp provolone slices (about 16)
- Ketchup and/or hot sauce (for serving; optional)
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