Pinnis are unique only winter Punjabi sweet. pinnis are made with flour or they may be even made with moong dal or udad dal that is browned in a wok. They also contain mixed nuts , ajwain or sesame seeds.  Pinnis are made and served in cold winter months as they give warmth and help in fighting winter chills. Pinnis can be stored in air tight containers and last for weeks, even months. Pinnis are sweetened with fine granulated sugar which also helps it last longer. The best thing is that they even do not need refrigeration. In days before refrigerator pinnis were stored in tall tin cans without any problem.