I tried this one with a couple of pieces of crystal sugar last night. It certainly increased the vanilla, strawberry and cake flavours, but I completely lost the coffee/espresso. It almost becomes a different tea, and I suppose that’s the point.
On balance, I think I enjoy this one without sugar more. I like the chocolate/coffee/strawberry playoff, and the way it culminates in a kind of strawberry mocha heaven. That’s too good to lose, even for stronger cake flavour!