I’m not much of a baker, but I like to offer a fruit-based dessert when I have friends over for dinner. This stone fruit gratin is my riff on a recipe from a French cooking magazine. Easy-peasy, rich fruit flavor, and you can adjust the sugar and butter content to your own taste. The gratin can be prepared ahead of time and go into the oven while you enjoy your dinner. The buttery pistachio crumble really brings out the lushness of the fruit.