Walnut Orange Passover Sponge Cake

Ingredients

 * 9 eggs
 * ¼ tsp salt
 * 18 tbsp sugar
 * ½ cup matzoh meal
 * ¼ cup potato starch
 * 1 tsp vanilla
 * ½ tsp orange extract
 * orange zest

Directions

 * 1) Spoon batter into a 10-inch tube pan lined in the bottom with baking parchment or greased brown paper.
 * 2) Place in a preheated 375°F oven and immediately lower heat to 325°F.
 * 3) Make until cake springs back to the touch, about 50 minutes.
 * 4) Remove from oven, let cool before inverting/removing.

Passover confectioners' sugar

 * 1) Place sugar and potato starch in a food processor and process until blended, about 3 minutes.
 * 2) Use as a garnish by sifting over cake lightly and arrange shreds of orange peel on top.