Cut sweet potato into 1 inch thick pieces.

Steam sweet potato for 15 minutes or until tender (when you can poke it with a fork easily).

Peel the skin off the steamed sweet potato, and mash with a fork or potato masher until smooth.

Mix in tapioca flour and stevia with a spatula until a dough forms. If the dough seems too sticky, add more tapioca flour until you get a dough that doesn’t stick to your hands when shaping.

Using your hands, shape the dough into little round balls. After all the dough is used up, lightly dust the boba with some tapioca flour.

Prepare an ice bath.

Bring a large pot of water to a boil. Add sweet potato boba and cook for 1 minute or until they float. Drain and transfer to ice bath immediately. Drain again and the sweet potato boba is ready for use!