PREPARATION:

1. Let dough stand at room temperature about 15 minutes.
2. Combine dough and flour in large bowl; beat until well blended. Divide dough into 3 equal pieces. Add lemon extract and yellow food coloring to 1 dough piece in medium bowl; beat until well blended. Shape lemon dough into 6X1-1/2-inch log; flatten 1 side of log so that log has half-moon shape. Brush rounded side of log with egg white; sprinkle with yellow sugar until evenly coated. Wrap tightly in plastic wrap; freeze 1 hour. Repeat with second piece of dough, lime extract, green food coloring and green sugar. Repeat with remaining piece of dough, orange extract, orange food coloring and orange sugar.
3. Preheat oven to 350°F. Lightly grease cookie sheets. Cut logs into 1/4-inch slices; place 2 inches apart on prepared cookie sheets. Sprinkle with coarse white sugar.
4. Bake 9 to 11 minutes or until set. Working quickly, score segment lines on hot cookies. Cool on cookie sheets 2 minutes. Remove to wire racks; cool completely.