Preheat oven to 350 degrees Fahrenheit. Grease one (10-inch) tube pan or one (9×13-inch) baking pan well (or line with Gefen Parchment Paper) and set aside.

In the bowl of an electric mixer fitted with the whisk attachment, beat egg yolks until light. Add sugar, lemon juice and wine; mix well. Stir in cake meal and potato starch.

In a second bowl, with a clean whisk, beat egg whites until stiff; fold into batter.

Transfer one third of the batter to a small bowl; blend in cinnamon.

Spoon cinnamon and white batter alternately into prepared pan to make a marble effect. Swirl the cake with a knife to get a pretty pattern.

Bake for 50 to 60 minutes, until a toothpick inserted in the center comes out clean and top is nicely browned. Allow to cool.