INGREDIENTS
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1 tablespoon plus 1 teaspoon vegetable oil
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2 medium white onions, halved, sliced 1/4 inch thick lengthwise
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3 red or orange bell peppers (ribs and seeds removed), sliced 1/4 inch thick
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Coarse salt and ground pepper
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4 spicy or sweet Italian turkey sausages (about 1 pound total)
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4 hoagie rolls or 1 loaf French bread (cut into 4 pieces), split and toasted
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Grainy mustard (optional)