Cut sweet potato cut thickly after skin removed. Steam under high heat for about 30 minutes or till soft. Mash sweet potato with a fork while it is still hot.

In a pot, add water, sugar and agar agar, stir to boil medium heat. Pour mashed sweet potato into it and stir till combined at low heat for about 1 minute.

Blend sweet potato mixture to smooth till paste. Then pour into a 6 inch square pan (grease pan with little oil). smoothen by a spatula.

Leave to cool, then chill in the refrigerator to set for at least 2 hour before consuming.