Cook sweet potato on a medium heat for approximately 10 minutes until softened and then drain and peel.
Mash sweet potato until a puree is formed, then add egg, Dorot crushed ginger cubes, flour and salt & pepper and mix thoroughly until uniform. Place the mixture in the refrigerator for ½ hour.
Remove the mixture from the refrigerator and form into latkes.
Heat the butter in a large frying pan and fry each latke for approximately 3 minutes each side and then remove from the pan.
Sauce:
In a small bowl, mix sour cream with chives and then season with salt & pepper.
Place a spoon of sour cream mixture onto a plate and place latkes on top and serve.