Green bamboo tube. The bamboo tube used for bamboo tube zongzi should be delicate, soft, smooth and easy to clean. Green bamboo tube is better. When it is baked or steamed, the bamboo fragrance will be more and the taste will be better. Zongzi, a delicious food with glutinous rice as the main material and wrapped in Zongzi leaves, is one of the traditional festival foods of the Chinese nation.