Shooter's Steak Sandwich

Details

Ingredients

• 1 tablespoon olive oil
• 1 tablespoon butter, divided
• 1 ½ pounds button mushrooms, finely chopped
• salt
• ½ cup minced shallots
• 2 tablespoons brandy
• 1 pinch cayenne pepper, or to taste
• salt and freshly ground black pepper to taste
• 3 tablespoons Dijon mustard
• 1 tablespoon extra-hot prepared horseradish, or to taste
• 1 tablespoon mayonnaise
• 1 (1 1/2) pound round loaf of crusty bread
• 2 (1 pound) beef rib-eye steaks, well trimmed
• salt and freshly ground black pepper to taste
• 1 tablespoon vegetable oil
• ¼ cup water
• 3 ounces finely textured pate (such as foie gras), sliced