Improved Three-Layer Semifreddo

This semifreddo is composed of three layers plus a sauce:

1. First Layer (Praline): almond, sugar, and preserved lemon.
2. Second Layer (Ice Cream Layer): egg, milk, tapioca flour, sugar, heavy cream, and meringue.
3. Third Layer (Pâte à Biscuit): meringue, egg yolk, medium flour, almond flour, butter, sugar, lemon zest, and preserved lemon.
4. Sauce: limoncello, lemon juice, and preserved lemon.

Real Facts: Semifreddo (Italian: half cold) is a class of semi-frozen desserts, typically ice-cream cakes, semi-frozen custards, and certain fruit tarts. It has the texture of frozen mousse because it is usually produced by uniting two equal parts of ice cream and whipped cream. Such a dessert's Spanish counterpart is called semifrío. In Italian cuisine, the semifreddo is commonly made with gelato as a primary ingredient.