Bunching onions do not form real bulbs. In lieu of this, they have a green leaf portion and a long blanched white stalk portion. Bunching onions are very tender an well flavored, excellent for stir-fries, sukiyaki, tempura, and congee. These onions are as nutritious as they are delicious, containing two compounds crucial to good health-sulfur and quercetin. Sulfur detoxifies the body and heals. wounds. Quercetin contains antioxidant properties, combats allergies and viruses, and aids in cellular repair.