Separate the eggs while they are cold and allow them to come to room temperature
Meanwhile, whisk together the cake meal, potato starch and salt.
Preheat oven to 325 degrees F. Have rack in lower middle of oven, and have ready an ungreased tube pan with legs.
In the bowl of a stand mixer using the whisk attachment, beat the egg whites until foamy. Gradually add ½ cup (100 grams) of the sugar and beat until white with soft peaks. Put the beaten egg whites in the refrigerator for 10 minutes.
Meanwhile, in a second stand mixer bowl, beat the yolks and remaining ½ cup plus a tablespoon of sugar (112 grams) for one minute. Beat in the lemon juice and the lemon zest. Stir in the matzo meal mixture. The mixture will be a dark goldenrod type color.
Remove egg whites from the refrigerator and fold in about ⅓ of them to lighten the mixture. Continue folding another third of the egg whites, keeping mixture light. Fold in remaining until batter is uniform.
Scrape into the pan and run a scraper through it to even it out.
Bake until toothpick inserted into center comes out clean and cracks in cake appear dry, about 45 to 50 minutes. Let cool upside (give it at least 2 hours)
To unmold, slide a knife around the edges. With the tube pan sitting on flat surface, slide the knife under the cake and carve it out from around the tube.