The sauce contains more sugar in order to make a longer shelf life, considering a "best before"date and the costs of selling throughout the whole country, and the dumplings are not browned because the sauce contains a small portion of soy sauce giving a strong caramel flavor if it is browned.
消費期限と全国販売のコストにより、保存性を高めるために砂糖の割合を増やし、焼き目をいれていない（醤油の割合が少なく、焼いてもカラメルの匂いが強い為）。