Five Star Filet Mignon Stuffed with Mushrooms & Onions Recipe - (4.8/5)

Ingredients

• 1/4 cup (4 tablespoons) unsalted butter
• 1 Vidalia onion, finely chopped
• 1 tablespoon fresh rosemary, finely chopped
• 4 cups diced portobello mushrooms (about 2 large mushrooms)
• 1/2 cup dry white wine
• Salt and freshly ground black pepper
• Six 8-ounce filet mignon steaks (about 2 inches thick)
• Olive oil, for brushing
• Bearnaise Sauce, recipe follows
• 1/4 cup dry white wine
• 2 tablespoons fresh tarragon, finely chopped
• 2 tablespoons Champagne vinegar
• 1 clove garlic, minced
• 1 shallot, minced
• Kosher salt and freshly ground black pepper
• 1 cup (2 sticks) butter, at room temperature
• 4 egg yolks
• 1 tablespoon fresh lemon juice, optional