The recommended 15 shakes mixes all the ingredients. You have to do it before you poke the straw in, otherwise it’ll spill.
I couldn’t get to taste the layers - the mousse, the milk, and the brown sugar part.
It isn’t too sweet, but maybe because of the mixing, I don’t fancy it that much. Can’t taste much brown sugar and feels quite normal, though there is a slight hint of caramel. Will go back to R&B with less queue for $3.90!