INGREDIENTS
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2 tbsp. olive oil, divided
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2 extra-large portabella mushrooms, thinly sliced
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2 tbsp. red wine
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salt + pepper to taste
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1 small green pepper, thinly sliced
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1 large onion, thinly sliced
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8 slices provolone or mozzarella cheese
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4 sub rolls, sliced lengthwise (don't completely cut the top from the bottom, though!)