Zabaglione Frozen Dessert with Amaretto Cookies

Semi, in Italian as in English, means half or partially; freddo is Italian for “cold.” A semifreddo is not whipped in an ice cream freezer, but it is frozen packed in either a rectangular or a round container. It becomes firmer than a gelato and it is served sliced if it comes out of a loaf pan or cut into wedges if unmolded from a pie pan. Among its ingredients there are always some that will not freeze—components such as biscuits, candied fruit, pound cake, and whippe