Mmm... I had one today. The divine taste of a good old Cassata ice cream features in my version of heaven. It's my favourite kind of dessert when I dine out, but it is not commonly available in a lot of restaurants and the regular ice-cream shops don't have these.
I don't know how popular they are outside India and in what variants they are available but I know that I cannot have enough of this. What I especially like is the crispy layer of cake merged with the icecream and all those bits and pieces of nuts and fruity bits. The best part is the fruity flavour that's left in the mouth afterwards.
There seems to be one variant that I can fathom: the one featuring the cake predominantly. According to Wikipedia it's Italian sweet
and I guess the ice-cream evolved from that.