8 9eggs, separated 1csugar 1cground almonds or walnuts 0.5cchopped almonds or walnuts 1Tpotato starch 3Tsifted matzo cake meal, plus more to flour the cake pan 1Tpowdered instant coffee 4ozbittersweet chocolate, coarsely grated 0grated zest of 1 large orange Preheat the oven to 350 degrees. Grease a 9- or 10-inch tube pan with pareve shortening (see note) or oil, and dust with cake meal. Whip the egg whites until foamy. Slowly add 1/2 cup sugar while beating until stiff but not dry. Set aside. Beat the egg yolks with the remaining 1/2 cup sugar. Fold the yolks into the whites. Gently fold the remaining ingredients into the egg mixture. Pour the batter into the tube pan. Bake for 45 minutes. Cool slightly, then run a knife around the cake. Flip out onto a plate, and serve.