Was popcorn popcorn or glutinous rice in Song Dynasty?

Popcorn in Song Dynasty is glutinous rice flower.

On this day, farmers in southern China celebrate the arrival of the solar term by frying glutinous rice. The more glutinous rice blooms, the better the harvest will be.

Since the Song Dynasty, people in wuyue have had the custom of "divining the rice harvest on the 13th and 14th of the first month": stir-frying glutinous rice flowers indicates a bumper harvest of rice, and the more sparkling popcorn, the better the color, which indicates a bumper harvest of rice this year.