A gaiwan is a Chinese lidded bowl  used to brew tea leaves and the consumption of tea. The lid allow the tea to be infused right in the bowl and either drink right from the bowl or pour into pitcher/chahai. Gaiwan is the preferred method for brewing green or white teas as the gaiwan's porcelain absorbs the heat and does not damage the tea. They are especially common in the north of China for enjoying scented tea like jasmine tea.