Beat 3 eggs at high speed for 5 minutes. Gradually, add 1 cup sugar. Stir in two third cup pumpkin and 1 tsp. lemon juice. Mix the next 6 ingredients and fold into pumpkin mixture. Pour into a greased and floured cake pan. Top with chopped walnuts. Bake @ 190ºC or 15 minutes. After baked, sprinkle a towel with powdered sugar. Tip cake out onto the towel. Sprinkle the cake with powdered sugar. Roll up in the towel and let cool. Topping: Place powdered sugar, cream cheese, butter and vanilla extract in mixing bowl. Beat until smooth. Unroll cake, gently, and spread withcream cheese mixture. Roll cake again. Chill.