Peel off the sweet potatoes and cut it into pieces that you can easy to eat.
Put water and sweet potatoes in a pot and boil until it become soft.
cut the lemon in round
Put water, sugar, salt and lemon slices into another pan and boil.
After boiled, add boiled sweet potato into a pan and heat it with low heat until lemon flavor is on. If you simmer too much, the sweet potato shape will collapse, so let’s stop the fire once lemon flavor is on.