To blanch greens, bring a pot of water to a boil and add greens. For most greens, boil 1–2 minutes; dandelion leaves, boil 5–10 minutes, tasting along the way to adjust bitterness.
Drain and transfer to a bowl of ice water to stop cooking. Firmly squeeze excess water from greens. Chop greens into smaller pieces.
Mix soy sauce, sesame oil, minced garlic and sesame seeds in a small bowl. Toss greens in soy sauce mixture until evenly coated.
Transfer to a plate and garnish with extra sesame seeds, if desired.