Yes — Beijing has a documented halal food scene around Niujie Mosque
Yes — Beijing has a documented halal food scene around Niujie Mosque It's centered on Niujie (牛街, 'Ox Street') in Xicheng District, which Wikipedia describes as Beijing's largest Muslim-inhabited area, built around Niujie Mosque — one of the oldest mosques in China, first built in 996 CE.
Background
Niujie Mosque sits in Xicheng District and can hold up to 1,000 worshippers. Wikipedia places it within walking distance southwest of Caishikou Station, and notes nearby markets historically known for halal beef and mutton plus Muslim grocery stores along the street. Eat on Niujie itself by reading shopfronts: 清真 (qīngzhēn) is the mark.
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