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I came across these today.

苏子 (sū zǐ), Perilla frutescens, Perilla seeds.

According to the distributor 

Quote

Perilla seeds have a unique herbal fragrance, and if you smell it carefully, you can also detect a light nutty aroma. When stewing fish, it can effectively break down the fishy smell in fish meat. The fishy smell of fish mostly comes from nitrogen-containing compounds such as trimethylamine in its body, and the aroma emitted by perilla seeds can react with trimethylamine and other substances to wrap up and neutralize the fishy smell.

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(my translation)

 

I keep telling them "If your fish smells 'fishy', change your fishmonger. It's not fresh!", but they don't believe me.

I came across these today.

苏子 (sū zǐ), Perilla frutescens, Perilla seeds.

According to the distributor 

Quote

Perilla seeds have a unique herbal fragrance, and if you smell it carefully, you can also detect a light nutty aroma. When stewing fish, it can effectively break down the fishy smell in fish meat. The fishy smell of fish mostly comes from nitrogen-containing compounds such as trimethylamine in its body, and the aroma emitted by perilla seeds can react with trimethylamine and other substances to wrap up and neutralize the fishy smell, reducing the fishy smell.

.

(my translation)

 

I keep telling them "If your fish smells 'fishy', change your fishmonger. It's not fresh!", but they don't believe me.