Like their inspiration, lemon meringue pie, these cookies have three elements. They’re built on simple, slice-and-bake French shortbread cookies, rich, buttery and flavored with vanilla. The shortbread base is almost classic, except that the cookies are baked in muffin tins, so they’re straight-sided and deeply golden brown. The “filling” is lemon curd, and the topping is crunchy bits of meringue. You get crumbly, velvety and crackly, sweet and tart in every bite. These cookies were created for an imaginary friend, Chief Inspector Armand Gamache, the hero of 16 Louise Penny novels, and a man who considers lemon meringue divine.