Ingredients
- 1 1/2 pound London broil
- 1/2 cup olive oil, plus more for brushing steak
- Salt and pepper
- 1/4 cup balsamic vinegar
- 4 portobello mushroom caps, cut in slices
- 1 Vidalia onion, cut in rings
- 1/2 cup mayonnaise
- 1 tablespoon grated horseradish or grainy mustard
- 1/2 cup chopped fresh parsley
- 1/2 lemon, juiced
- 4 pieces ciabatta bread, split horizontally
- 1/4 pound Fontina, sliced
- 1/3 cup (packed) coarsely chopped arugula leaves
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