Peel and cut the sweet potatoes into 1/2 inch cubes.

In a medium-sized saucepan, heat your olive oil over medium-high heat. Once the edges start becoming less opaque, add the soy sauce, garlic, brown sugar, and enough water just under the level of the potatoes.

Let simmer uncovered until potatoes have softened, but not completely broken down, about 15 minutes.

Transfer to a serving plate and garnish with the sesame seeds. Serve warm or at room temperature.