Swiss Onion Tart
["1 (10-inch) pastry shell", "2 Tbsp. butter", "1 1/2 lb. white onions, chopped", "1 Tbsp. flour", "2 egg yolks, beaten", "1 c. heavy cream", "salt and pepper to taste", "dash of nutmeg"]
["Preheat oven to 375\u00b0.", "Over medium heat, saute onions in butter, slowly, until they are translucent and soft.", "Sprinkle flour over them, mix well and let cook a couple of minutes. Remove from heat and add egg yolks.", "Gradually stir in cream.", "Add salt, pepper and nutmeg.", "Pour into pastry shell.", "Bake 40 to 50 minutes or until filling is firm."]
["pastry shell", "butter", "white onions", "flour", "egg yolks", "heavy cream", "salt", "nutmeg"]