Where can I buy Zhoucun sesame seed cake in Beijing?

Zhoucun sesame seed cake has a history of hundreds of years, which was initiated by Guo Yunlong, a sesame seed cake shop at that time. Legend has it that he found a thin shell bulge on the horseshoe sesame seed cake, which was crisp and fragrant but not greasy, so he tried out this crisp sesame seed cake. Especially after the Ji Jiao Railway was completed and opened to traffic, this kind of crispy baked wheat cake became a delicious food that tourists rushed to buy, so the shops that produced crispy baked wheat cake flocked, among which "Juhezhai", "Dashunyong" and "Dongxing He" were the largest. [ 1]