Savory Upside-Down Pie
["7 1/2 oz. pkg. frozen puff pastry", "1 1/2 lb. ground beef", "1 tsp. salt", "1/2 tsp. pepper", "1 large onion, chopped", "3 egg yolks", "1 c. mushrooms", "4 oz. bacon slices", "1/2 c. crumbled Blue cheese", "1 Tbsp. chopped sorrel and chervil"]
["Thaw pastry.", "Mix ground beef, salt, pepper and onion; bind with egg yolks.", "Wash and quarter mushrooms.", "Cover the bottom of an 8-inch loose bottomed cake pan with the bacon.", "Arrange the cheese, herbs and mushroom quarters on top.", "Cover the meat mixture, pressing it down firmly and smoothly on the top."]
["frozen puff pastry", "ground beef", "salt", "pepper", "onion", "egg yolks", "mushrooms", "bacon slices", "cheese", "chervil"]