Peeled and roughly cut into small the sweet potato.
Place the sweet potato in a large saucepan and add enough water to cover. Then boil over medium-high heat until tender about 15 minutes. Or cook on full power in the microwave for about 6 minutes until tender.
Put the sweet potato, the soy milk and the cane sugar into a food processor. And process until well combined. Then taste it, add more sugar if necessary. Optionally add the vanilla extract.
Place the water and the ager-ager powder in a large saucepan and bring to boil as whisking. When it starts boiling, keep whisking for another 2 minuts until slightly clear.
Gently fold the sweet potato mixture into the ager-ager mixture in the saucepan as whisking vigorously. When It’s well combined, pour into dishes. Then put in a fridge for at least 3 hours.