Try the Ube McDip from McDonald's.
We just knew about this when we met a girl eating one along our way to McDonald's Abreeza. This one costs P20 for the large one and was supposed to be with crispies. They don't have available crispies that time which was fine with me. IMO it does not taste much of ube but just a little hint of it as you try to finish the whole sundae before it totally melts.
Well it's still worth a try. You might even love it!