Lili loves to cook baos, and Nai Nai has taught her all the secrets to making them, from kneading the dough lovingly and firmly to being thankful for the strong and healthy ingredients in the filling. But when Nai Nai realizes that they are out of cabbage (Secret #8: line the basket with cabbage leaves!), she sends Lili up to Babcia's apartment on the sixth floor to get some. Babcia is happy to share her cabbage, but she needs some potatoes for...