Steak and Portobello Sandwich

Ingredients (8)

• 1.5 lbs strip, flank, or skirt steak
• 0.5 tsp salt
• 6 clove garlic crushed
• 1 olive oil spray
• 1 cup balsamic vinegar
• 0.5 lbs Portobello mushrooms
• 4 whole-wheat hoagie rolls
• 0.25 tsp freshly ground black pepper