Combine all of the marinade ingredients in a small mixing bowl and stir until well combined.
Transfer the marinade liquid to a shallow dish, add the tofu cubes, and toss to coat.
Let them marinate covered in the fridge for at least 15 minutes. If you let them marinate longer, they will have a more intense flavor.
Drain the tofu but don’t discard the marinade liquid. Set aside.
Add the marinade liquid to a small mixing bowl along with the cornstarch and mix until well combined. Set aside.
Heat the oil in a non-stick pan or a skillet and sautée the tofu over medium-high heat until golden brown, stirring occasionally.
Pour the marinade liquid into the pan or skillet and cook until it thickens. Serve immediately