Imagine a Key Lime Pie light as a cloud, tart one moment, sweet the next. Imagine it has done away with the distraction of a crust. What you have is this Key lime mousse. Now, I love a pie, crust and all, but when a mousse is this good, it refuses to serve as mere filling. “Filling” implies that it is not complete in itself, and this dessert certainly is. Unmoored from the classic Graham cracker crust, it is something altogether more delicate—a soft, chilled summer sweet that is richer than sorbet, breezier than ice cream.
~ Aleksandra Crapanzano, Key Lime Pie Without the Crust (Recipe below)