Cook the somen noodles in boiling water, rinse under cold water, and drain well.
Beat the eggs and scramble them until cooked.
Finely chop the onion and scallion.
Heat cooking oil in a pan and sauté the onion and scallion.
Add soy sauce, oligosaccharide syrup, and minced garlic to make the sauce.
Add the cooked somen noodles and scrambled eggs to the pan, then stir-fry with the sauce.
Plate and garnish with sesame seeds and chopped green onions.