Hot Portobello Mushroom Sandwich

By Dana RB

4.2 / 5

10min

5min

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1 portobello mushroom cap cut into 1/2-inch slices
1 tablespoon red wine vinegar
2 slices pumpernickel rye bread
1 tablespoon Dijon mustard
1 tablespoon sliced pimento-stuffed green olives
2 slices Havarti cheese