Bake the Cake
Preheat oven to 350°F (180°C).
Beat egg whites until stiff. Set aside. Beat egg yolks until thick and lemony, gradually adding the water, salt, sugar, and oil. Add potato starch, one tablespoon at a time. Fold in egg whites.
Pour into a jelly-roll size pan lined with Gefen Parchment Paper. Bake for 10–12 minutes. Cool.
Cut into four even strips of cake (I do this with a ruler). Trim ends if desired.









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