Place one slice of bread on a flat surface and generously layer mozzarella cheese on top.

Slice the boiled sweet potato and layer it on top of the cheese.

Add a handful of raisins on top for added texture and sweetness.

Add another layer of mozzarella cheese generously and cover with another slice of bread.

Cook the sandwich in a dry frying pan or panini press over medium-low heat until the cheese melts.