Directions:
In a large nonstick skillet, sauté sausage until browned, about 5 minutes.
Add onion and oil. Sauté until softened, about 5 minutes longer. Transfer to a plate.
In skillet, sauté peppers until softened, about 5 minutes. If necessary, add up to 4 tablespoons water to prevent sticking.
Stir in vinegar, then return sausage mixture to skillet. Toss to combine.
Split bread lengthwise, almost all the way through, and spread open. Top with sausage mixture.
Close bread, then cut crosswise into 4 sandwiches.
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