Trim the roots off enoki mushrooms and clean them thoroughly.
Slice the onion thinly and chop the green onion.
Heat cooking oil in a pan and stir-fry the onion and green onion.
When the onion becomes translucent, add the enoki mushrooms and stir-fry.
Season with soy sauce, oligosaccharide syrup, and sesame oil.
Place the stir-fried enoki mushrooms on top of rice and sprinkle with sesame seeds.