In a large bowl, beat egg yolks with 1/2 cup of granulated sugar until thick and pale yellow. Stir in the vanilla extract and a few drops of green food coloring (if using).
In a separate bowl, sift together cake flour, salt, baking powder, and cocoa powder.
Gradually add the dry ingredients to the egg yolk mixture, mixing until smooth.
Whip Egg Whites:
In another clean bowl, beat egg whites until soft peaks form. Gradually add the remaining 1/4 cup of granulated sugar, beating until stiff peaks form.
Combine Batter:
Gently fold the beaten egg whites into the egg yolk mixture, a third at a time, until well combined and no streaks remain.
Bake the Cake:
Spread the batter evenly into the prepared jelly roll pan, smoothing the top with a spatula.
Bake for 12-15 minutes, or until the cake springs back when lightly touched.
Prepare for Rolling:
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