London Broil and Portobello Sandwich

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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