Instructions: To prepare pastry: Sift flour. Stir in salt and yeast. Using a fork, work in the butter until each particle is coated with yeast and flour.

Lightly beat egg yolks; add to butter mixture along with 1 teaspoon vanilla and sour cream. Work together until dough is smooth. Wrap in waxed paper; refrigerate while you make the filling.

To prepare filling: Beat egg whites until stiff. Gradually beat in granulated sugar and remaining 1 teaspoon vanilla. Fold in pecans and lemon rind. Preheat oven to 400 degrees. Divide dough into 8 parts. On a board sprinkled with powdered sugar, roll out each part to a 9-inch circle. Cut each circle into 8 equal wedges. Put 1 teaspoon filling on each piece and roll up, starting at wide end and shaping into a crescent. Bake on greased cookie sheets 15 to 18 minutes, watching carefully, until each cookie is very delicately browned. Sprinkle with powdered sugar when cool.

Yield: 64
cookies.

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