Wash the sweet potatoes and pare them.
Slice them, cut into 1cm.
Boil (or steam) them.
Srain them and divide into two pieces.
Mix the powdered tea into one of pieces.
(Mix the lots of sugar into the tea one.)
Wet the strained sweet potatoes and put them
on the gauze.
Twist the upside.
(tea one and the another one, it looks beautiful.)