"Editor's note: This recipe is part of a special Thanksgiving menu created by chefs Allison Vines-Rushing and Slade Rushing of MiLa restaurant in New Orleans. Pecan pralines are one of the most celebrated candies of the South. They are made with pecans, sugar, and cream, which results in a unique crystallized and cloudy caramel that melts in your mouth. The European praline, however, is made simply with sugar and nuts, which results in a shiny hard-crack bitter-and-sweet candy. This Italian-style semifreddo (half frozen) uses the latter, which holds up well when frozen. However, we still use cream, but in a soft, fluffy base that cradles the crispy praline...."