Preheat oven to 375 degrees.

Place sugar and eggs in top of a double boiler over hot but not boiling water, and beat until egg mixture is lukewarm. Remove from over the water and continue beating until foaming and cool.

Add lemon rind and flour slowly and blend in gently.

Drop by teaspoonfuls on buttered and floured baking sheet, leaving a space of 1 inch between them.

Sprinkle with confectioner’s sugar and pine nuts. Let stand 10 minutes.

Bake for 10-15 minutes.