Lightly spoon flour into a dry measuring cup, and level with a
knife. Combine flour and the next four ingredients (through
ground ginger); stir with a whisk. Combine sugar and butter in a
large bowl, and beat with a mixer at medium speed until light
and fluffy (about 5 minutes). Scrape sides of the bowl
occasionally. Add egg; beat well. Beat in grated lemon rind. Add
flour mixture to butter mixture, and beat at medium low speed
just until blended.
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