Place the yuca,½ tablespoon of salt, and water in a large pot. Cook over medium heat until the yuca is soft and tender. Drain the yuca and discard the water.
Using a potato masher or food processor. Mash the yuca and mix with the remaining salt.
Form small balls with the mashed yuca using your hands and place on a plate.
Fill a large skillet with oil, deep enough to cover an entire ball and heat over medium-high heat.
Carefully add the yuca balls to the oil and fry them for about 2 to 4 minutes or until golden on all sides, turning over once about halfway through.
Remove from the oil and transfer to a plate lined with paper towels to absorb the oil. Sprinkle with the sugar, and cinnamon if using, while warm.