Zhèjiā cāntīng zhuānmén tígōng zhèngzōng de héshí.
This restaurant specializes in authentic Japanese cuisine.
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culture
和食 is borrowed from Japanese 和食 (washoku), where 和 ("harmony") is also a self-referential prefix for things Japanese. UNESCO inscribed washoku on its Intangible Cultural Heritage list in 2013, which boosted Chinese-language use of this loan term.
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Common in restaurant menus, food media, and travel writing. For "Japanese food" in casual speech, Chinese speakers more often say 日本菜 or 日本料理.