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.”