INGREDIENTS
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5 teaspoons EVOO
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2 red onions, thinly sliced
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Salt
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3/4 pound flank steak, very thinly sliced against the grain into strips
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6 ounces portobello mushroom caps, thinly sliced
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1 whole wheat baguette (about 14 oz.), split, then sliced into 4 subs
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6 slices provolone (about 4 oz.), halved