Preheat oven to 350°F. Prepare a baking sheet with greased parchment paper.
In a medium bowl, whisk the matzo cake meal, potato starch and salt together, set aside.
In a stand mixer with the whisk attachment, whip the eggs and sugar on high speed, for about 8 minutes. The eggs should be very light in color and a thick foam. Mix in the vanilla and zest.
Remove the bowl from the mixer. Sift 1/3 of the dry ingredients over the egg foam and use the whisk attachment or a rubber spatula to fold the flour into the foam by hand. Repeat the sifting and folding with the next 1/3 of the dry ingredients. Repeat with the final 1/3 of the dry ingredients.
Pour the batter into the prepared pan and spread evenly with an offset spatula.
Bake the cake for about 10 to 12 minutes or until golden and set when tested with a cake tester.
While the cake is baking, dust a large, clean kitchen towel generously with confectioners’ sugar.
As soon as the cake is done, run a knife around the edges and invert onto the sugar dusted kitchen towel. Peel off the parchment paper and lay it back on to the cake, then roll the cake, starting at the short end, using the towel, into a log. Allow to cool completely before filling.