Preheat the oven to 325 degrees F. Butter a cookie sheet and dust it with some flour.
Place whites in the bowl of an electric mixer and whip to soft peak. Add the sugar steadily and beat for 2 minutes. Stop the machine and add the flour, vanilla, amaretto, zest, and cocoa powder. Mix for 1 minute and stop the machine. Stir in the nuts quickly and place 2-inch blobs on cookie sheet 1-inch apart. Bake 30 minutes until crisp. Remove and allow to cool.