Marinated Steak Sandwich with Goat Cheese Butter - Martin's Famous Potato Rolls and Bread

Ingredients

• 4 Big Marty’s Rolls
• 2 Tablespoons Olive Oil
• ½ Lemon, juiced
• 2 Sprigs Fresh Rosemary, chopped
• 1 Garlic Clove, minced
• Salt
• Pepper
• 2 7-oz Rib Eye Steaks, thinly sliced
• Optional: Fresh Parsley, for serving
• 1 Tablespoon Olive Oil
• ½ Pound Mushrooms, thinly sliced
• 1 Large Onion, thinly sliced
• 2 Tablespoons Balsamic Vinegar
• 3 oz Fresh Goat Cheese
• 3 ½ Tablespoons Butter, room temperature