GRILLED FLANK STEAK SANDWICHES (Adapted from Michael Kramer) - Tailgate Guru

Ingredients

• 1 – 1 3/4-pound flank steak
• 1 TBSP Dijon mustard
• 1/4 cup dry red wine
• 1/4 cup extra virgin olive oil
• 4 large garlic cloves
• 1/2 tsp finely chopped thyme
• 1/2 cup mayonnaise
• 1 tsp fresh lemon juice
• Salt and freshly ground pepper
• 8 rosemary focaccia or other rolls, split
• 1/2 lb sliced imported provolone or Fontina cheese
• 8 lettuce leaves or a bunch of arugula