Prepare the Garlic (1 clove) and Scallion (1 tablespoon) if using. Set aside.
Rinse the Bean Sprouts (350 gram) thoroughly, discarding any that are no good.
Bring the Water (5 cup) to a boil and add Salt (1 tablespoon), then add the mung bean sprouts and boil for two to three minutes.
While sprouts are boiling, mix the Toasted White Sesame Seeds (1 tablespoon), garlic, Salt (1 teaspoon), Sesame Oil (1 tablespoon), and scallion in a mixing bowl.
Add sprouts to mixing bowl and toss until the seasoning sauce is thoroughly mixed with the sprouts.
Plate up, adding Korean Chili Flakes (1 pinch), if desired. Serve.