I am planning to make Jiaozi (Chinese dumplings) for a friend's party. Because she is vegatarian I'd like to make one set of vegetable dumplings and one set of conventional dumplings. To make it easy to tell these apart I'd like to color the dough for one of them.
Can you suggest me a simple way to color the dough of the dumplings? The dough for Jiaozi is simply made from water and flour. I am mostly interested in ways to color the dough that use "natural" integredients as she does not really like artificial stuff. Also, what is the traditional Chinese way to color dough?