I'm not going to lie, these Strawberry Rolls are a bit messy to assemble. If your jam is leaking out a lot, this is most likely not been cooked and thickened long enough. It won't massively impact the rolls, but it does make them messier to handle during assembly. This can also mean that the filling has a greater tendency to leak into the base of the tray, meaning the bottoms of your rolls may become a bit gooey with extra concentrated strawberry sauce at the bottom.