"Forget the bread and use mushrooms...."
INGREDIENTS
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3 tbsp. extra-virgin olive oil, divided
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4 medium portobello mushrooms, stems and gills removed
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1 onion, sliced into half moons
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2 bell peppers, sliced
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kosher salt
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Freshly ground black pepper
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1 lb. sirloin
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4 slices provolone
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chopped parsley