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If it's tonkotsu ramen, it should be Ichiran.

Ichiran is a famous ramen restaurant from Japan. According to their official website, they specialize in a kind of ramen called tonkotsu. This kind of ramen originated in Fukuoka and is more commonly known in the region as the Hakata ramen. 

Tonkotsu literally means pork bones, which is the main ingredient of the broth of this kind of ramen. 

This kind of ramen is prepared by boiling such pork bones in water for at least 8 hours, in order to extract the genuine richness of the pork bones. 

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