Cut the sliced bread to the sides
Purple potato washed and steamed
Mix the cooked purple potato into the mud and mix the milk evenly.
Put the sliced bread to the side of the steamed purple steamer and use the remaining temperature of the steamed purple potato to soften the bread.
Use a rolling pin to thin and shape the bread
Spread the purple potato puree and banana on the sliced bread and roll it up
Oblique from the middle into two breaks
More purple potato puree can be put into a round shape, topped with a layer of condensed milk, which is a cottage version of purple potato ice cream
Bananas should be smaller than some "skinny", otherwise it will not be good.