2 cups sugar
1 cup cake meal
2 tbsp. potato starch
2 ounces bittersweet chocolate (Julie uses the "Elite" brand)
Preheat the oven to 350°F.
Beat the eggs and sugar on high speed for 15 minutes. (Use speed #8 on Kitchen-Aid mixer.) Add the cake meal and potato starch, beating at the lowest speed until mixed in. Melt the chocolate (you can melt it while beating the eggs and sugar). Pour 3/4 of the batter into an ungreased 10-inch tube pan. Add the melted chocolate to the remaining 1/4 of the batter and stir until evenly mixed. Spoon the chocolate batter into the pan and swirl it through with a knife.
Bake for 50 to 55 minutes. Immediately hang tube pan upside down on a long-necked bottle and let cool.