Beef Stroganoff - French Style Recipe - (4.2/5)

Ingredients

• 4 tablespoons unsalted butter
• 1 large onion, thinly sliced
• 1 pound white mushrooms, sliced
• Salt and freshly ground pepper
• 2 tablespoons Cognac
• 1 cup chicken stock
• 1/2 cup crème fraîche
• 1 tablespoon Dijon mustard
• 2 tablespoons extra-virgin olive oil
• 1 1/4 pounds beef tenderloin, sliced 1/4 inch thick and cut into 2-by-1/2-inch strips