Beef Wellington I Save Print Author: Big Messy Man Ingredients 1-1/4 pounds beef tenderloin 1 tablespoon butter, softened 1 tablespoon butter ½ onion, chopped ¼ cup sliced fresh mushrooms 1 ounce liver pate 1 tablespoon butter, softened salt and pepper to taste ½ (17.5 ounce) package frozen puff pastry, thawed ½ egg yolk, beaten ...