This recipe can easily be adapted for other flavors.
Substitute the lemon zest with orange zest.
Add dried fruits (1/4-1/2 cup) such as dried cranberries (craisins), dried cherries, dried apricots (chopped), candied orange or lemon peel.
Use other nuts such as walnuts, pecans, hazelnuts, pistachios (solely or as a combination of nuts.)
Add pine nuts (2 oz.)