Well, here in Brazil we have a flavor of ice-cream made of raisins. In fact it's a vanilla ice-cream with raisins hydrated on RUM. It's quite good, actually. I couldn't find it in English, so I guess it's not common to you folks, but I believe that would be the best suggestion for the milkshake. Maybe you could try again and check it out.
Maybe you could try again and check it out.