Beat eggs for 5 minutes. Gradually beat in sugar. Stir in pumpkin and lemon juice.
Sift together flour, baking powder, cinnamon, ginger, nutmeg and salt. Fold into pumpkin mixture.
Pour into well-greased and floured cookie sheet. Can be topped with nuts, if desired. Bake at 375° for 15 minutes.
Sprinkle powdered sugar on towel. Turn out cake onto towel and roll with towel inside. Cool.
Unwrap cake and spread with filling. Roll up without towel.