Where can I find popcorn in Beijing?

There is popcorn in Dongsi Hutong, Beijing. Beijing Dongsisi is the place that sells the most popcorn, which is delicious and cheap. It's all old-fashioned popcorn. Old-fashioned popcorn is delicious Microwave popcorn sold in the supermarket is also ok. Popcorn is a kind of puffed food made by putting corn, ghee and sugar together in a popcorn machine. It tastes very sweet. Put a proper amount of corn (or rice and millet) into the popcorn pot, seal the lid, and then put the popcorn pot on the stove and keep rotating to make it heated evenly, and then pop the popcorn.