As the saying goes, "Solstice Noodle in Winter and Solstice Noodle in Summer in jiaozi", is it a winter solstice or a custom in beginning of winter to eat jiaozi?

You can eat jiaozi in both solar terms.

Beginning of winter solar terms eat jiaozi from the saying "when eating jiaozi". "Jiaozi", also called jiaozi, has the meaning of alternation between the old and the new, while beginning of winter is at the turn of autumn and winter, so you can't help eating jiaozi when you make love, and eating jiaozi on this day is to commemorate the meaning of alternation between the old and the new.

As the saying goes, "On 10/day, when winter solstice comes, every family eats jiaozi." Jiaozi is a traditional food in northern China. In winter, the whole family get together to pack jiaozi and jiaozi, and the atmosphere is very warm. Therefore, there is a saying in Northeast China that "the jiaozi bowl is not served well on the solstice in winter, and nobody cares about the frozen ears". Eating jiaozi on the solstice in winter means praying for good health.