1. Beat yolks and sugar together until light, add grated rind and cake meal which has been sifted 4 times.
  2. Add salt to egg whites, beat until stiff and fold into dough.
  3. Line a jelly roll pan with wax paper, grease heavily, spread dough on evenly, and bake at 350°F for 12 minutes.
  4. When done, lift out paper with cake an place on a damp cloth for a few minutes, then invert on waxed paper sprinkeled with sugar.
  5. Remove paper from cake, spread with jelly beaten smooth (or boiled frosting), and roll up.
  6. Wrap in waxed paper, then in the damp cloth for about 15 minutes so that the roll will hold its shape.
  7. Remove wrapping and dust with powdered sugar.
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