This frozen dessert is pretty much a frozen mousse, which explains its name; semifreddo, is Italian for "half frozen." Here, it’s creamy-lemony with cream cheese tang and is accentuated by a buttery, toasty, sweet-and-salty nut crumble, which adds layered flavor and texture, not to mention extra healthy-fat macros. Though easy to make, this treat requires 4 hours in the freezer before serving, so plan accordingly. Once it’s made, it keeps in the freezer for one week. To serve, let it soften at room temperature for 30 minutes.