One of my husband’s never-wavering and absolute loves is white truffles. Fortunately for him, his birthday coincides with the height of the truffle season, and among my gifts to him there is always a tortino di tartufi. It can be very nice, on any ordinary day, to slice truffles on pasta, or a Parmesan risotto, or scaloppine, but in fulfilling a devotee’s longings, nothing does the job so thoroughly as a tortino. It is composed of layers of thin potato slices, Pa