This is a nice & simple dessert from the Florida Keys.
6 egg yolks 1 can of condensed milk. (No evaporated milk!) 4oz of Key lime juice (maybe lemon or lime juice will work too)
Blend eggs and condensed milk, pour juice slowly while blending, then beat like a cake. The longer you beat, the puffier it gets.
Oven temperature at 325F, 15min. Let it cool, then freeze.