Despite its name, this creamy dessert is surprisingly wholesome, getting its richness and velvety smooth consistency from egg yolks and milk rather than heavy cream. Ground almonds, or almond meal, gives it wonderful flavor and helps to thicken it even more. Grated lime zest and cinnamon are the only seasonings needed. It all starts by making a quick caramel with water and dark brown sugar, and this also lends the custard incredible depth. Serve chilled, preferably after being refrigerated overnight.