If you think 3 tablespoons of sugar is too much, feel free to reduce the amount to 2 tablespoons of sugar. If you are not vegan, consider using honey! It adds great flavor to the sauce. I also like my teriyaki sauce to be slightly thick, which is why I included cornstarch. Feel free to omit it.
Find it online: https://healthynibblesandbits.com/teriyaki-sauce/