"This sandwich is so tasty and succulent that you won't miss the meat...."
INGREDIENTS
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1 teaspoon olive oil
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1 onion slice, 1/4" thick
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1/4 red bell pepper, cut into thick strips
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1 medium portobello mushroom cap
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salt
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1 slice reduced-fat provolone cheese
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1 teaspoon prepared pesto
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1 focaccia roll or 1-2" slice focaccia bread (about 2 ounces)
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1 lettuce leaf
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1 slice tomato