from _The Way to Cook_ Pulverize one half the zest (reserve rest to be candied, if desired) with 1 cup of the sugar in food processor for 2 min., then add 1 1/2 cups of the juice and pulverize 2 min. More. In pan, combine zest with remaining sugar, bring to simmer and swirl pan until sugar dissolves. Remove from heat. Add remaining juice, and chill. Whisk in egg whites and freeze according to instructions. Pour a big spoonful of iced orange liqueur over each serving.