-
Boil sweet potatoes in a big pot, until tender, 20 to 30 minutes.
-
Pour the cooked sweet potatoes into a strainer, and let rest until there is no more liquid in the sweet potatoes, and they reach room temperature.
-
Pour the sweet potatoes into a large bowl. Mash the sweet potatoes using a fork.
-
Add flour, soy sauce, sugar, and salt to the potatoes. Mix together.
-
Transfer batter into a piping bag with a round 1 inch/2 cm tip.
-
Heat some olive oil in a large skillet over medium-high heat.
-
Pipe 1.5 inch/4 cm discs into the skillet, fry for 3-5 minutes on each side.