c("Process the lemon zest and sugar in a food  processor until the zest is as fine as the sugar.", "Add the butter.", "Process until fluffy.", "Scrape down the bowl.", "Add the flour, baking soda and salt.  Process briefly until mixed.", "Form dough into  two 1-1/2-inch-round logs and  wrap each in wax paper.", "Refrigerate until firm.", "Preheat the oven to 350°.", "Slice each log into 1/4-inch thick cookies and place on an ungreased baking sheet. Bake for 8 to 10 minutes, until golden  around the edges.", 
"Do not overbake.")