What does it mean to cook millet in July?

This sentence means that when the weather turns cold in July of the lunar calendar, people start harvesting and grinding millet.

1, "July filariasis" is the season when the weather turns cold in July of the lunar calendar. Streaming fire means that the sun tilts to the west and the solar terms move forward to the cold season. It also describes the sunset glow in July.

2. "Millet" means that in order to separate the husk from the grain, people will grind the grain in a stone mill or a wood mill in the traditional way until the grain is exposed.