Instructions: The next three recipes are for cakes made without wheat flour. This first one uses rice flour, but no wheat.

Preheat oven to 350F. Butter the sides of an 8 x 2-inch cake pan, line the base with a circle of baking parchment and butter the parchment. Using a nut mill, grind walnuts to flour and set aside.

Using the same nut mill, grind zucchini into fine shreds. There should be 1 cup, firmly packed, or 6 ounces. Place in a sieve and press out the liquid. Combine cornstarch, rice flour, baking powder and salt; set aside.

Beat eggs with sugar until lemon-colored and very thick. A lifted beater should leave a slowly dissolving trail of batter. Using a large rubber spatula, lightly fold in grated walnuts and minced lemon peel, as though mixing a souffle. Fluff up zucchini shreds and fold in. Sift cornstarch-flour mixture over batter and quickly fold in, retaining as much volume as possible.

Pour into prepared pan (the batter will be loose) and bake for 40 minutes, until a tester comes out dry. Let cool in pan for 10 minutes before unmolding onto a rack. Peel off paper, reverse onto rack right side up, and let cool completely.

Dust with powdered sugar before serving.

Serves 8.

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