There is nowhere else in Hong Kong that does better beef and egg sandwiches than Sun Hang Yuen. Aside from its trademark sandwiches, this 24-hour cha chaan teng (Hong Kong-style café) is also known for its pork knuckle noodles and milk tea, which can be ordered without sugar or with different milk ratios.
Address: 38 Kweilin Street, Sham Shui Po, Kowloon
Reference link: https://en.tripadvisor.com.hk/Restaurant_Review-g294217-d6974130-Reviews-Sun_Heung_Yuen_Kin_Kee-Hong_Kong.html
Sun Hang Yuen

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Ap Liu Street
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Address : 118 Pei Ho Street, Sham Shui Po, Kowloon
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Address : 104 Fuk Wa Street, Sham Shui Po, Kowloon