The secret to the Compost Cookie greatness is in the same salty-sweet combination that makes chocolate covered pretzels so brilliant.  And in the true spirit of composting, you can use whatever salty or sweet mix-ins you have lying around the house, which ensures a new and unique cookie every time you bake up a batch.  This recipe comes from Pastry Chef Christina Tosi of NYC’s Momofuku Milk Bar.  Compost Cookies are one of her best-selling desserts, and is a perfect cookie to try out on family and friends during this last week of cookie overload before the New Year.