Beef Wellington Recipe

Ingredients

• 2 1/2 pounds beef tenderloin
• 2 tablespoons olive oil
• 3 tablespoons butter
• 1 1/2 cups button mushrooms
• 1 cup porcini mushrooms
• 5 shallots peeled and finely chopped
• 1 small bunch parsley
• 2 slices sandwich bread
• puff pastry
• 1 egg yolk