Hot Portobello Mushroom Sandwich
Ingredients:
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1 portobello mushroom cap, cut into 1/2-inch slices
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1 tablespoon red wine vinegar
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2 slices pumpernickel rye bread
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1 tablespoon Dijon mustard
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1 tablespoon sliced pimento-stuffed green olives
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2 slices Havarti cheese