Sift potato starch cake meal, matzo meal, salt and cinnamon together. Beat eggs and sugar together. Add oil, beating well. Add sifted dry ingredients and nuts and blend well. Refrigerate for a while. Lightly oil a cookie sheet. Shape dough on sheet into 3 x 3 cm rolls. Bake at 180ºC . for 30 min., or until lightly browned. Cool slightly. Slice rolls and place, cut side up, on cookie sheet. Return to hot oven after turning heat opff. Let stand in oven until lightly browned and crisp. One tablespoon lemon or orange rind may be added instead of cinnamon. ----