I’ve been itching to make rapturously fudgy Double Chocolate Sorbet ever since our friends Adam and Pam served it on their porch four years ago. But who’s kidding whom? I don’t have a modern ice cream machine, and I’m not about to get one. That’s because my husband lives by Newton’s Third Law of Stuff: For every impulse to buy something, there must be an equal and opposite impetus to get rid of something. Every new kitchen gadget kicks out an old one. I recite this mantra for self-control, especially when fantasizing over the King Arthur Flour Kitchen Porn Catalog. Ah, that perky little Cuisinart ice cream machine would be my passport to homemade…