When he¡¯s not working, Scott Rohr of St. Paul, Minnesota, is baking. ¡°It¡¯s sort of a joke with my friends,¡± he said. ¡°I don¡¯t remember a time when I haven¡¯t baked. I grew up in one of those houses where everything was homemade. Some people come home from work and boil water for dinner. I take out eggs and butter.¡± For his winning recipe, Rohr started with his tattered recipe card for a cream-of-tartar-based sugar cookie, which is a copy of a similarly well-worn card from his grandmother¡¯s kitchen. The filling and the pistachios, however, were all his idea. ¡°I just started messing around,¡± he said. ¡°It¡¯s really hard for me to follow a recipe. These cookies aren¡¯t complicated, and they come together fast. They look like something substantial, but they¡¯re not hard to make. If you¡¯ve ever baked a cookie, then you can bake these, for heaven¡¯s sake.¡±