Grease bottom of a 9" x 13" baking pan, and preheat oven to 325 degrees. Beat egg whites in large bowl until stiff.  Beat egg yolks in small bowl until thick and lemon colored.

Add sugar to yolks and continue beating until thick and creamy, about 3 minutes on high speed; add oil, matzo meal, and lemon or orange rind, and mix well. Fold yolk mixture into whites until well blended, then fold in nuts.

Pour into pan, and bake at 325 degrees until cakes test
done with a cake tester or toothpick, about 40-50 minutes. 

When cool, sprinkle with confectioner's sugar.

24 servings