There's a video on TikTok in which a user takes a jar of seasoning called "Everything But the Bagel" and carefully separates the ingredients into small piles to find out the secret to the recipe. The video has been viewed almost 2 million times — a sign of just how popular this seasoning mix, made by US company Trader Joe's, has become. People like to put it on top of bagels and use it in lots of different meals. However, fans of the mix have been finding out that it's not welcome everywhere in the world. Signs have been posted at Incheon Airport in Seoul, telling passengers they can't bring jars of the seasoning into the country. The reason is that one of the ingredients is banned in South Korea. The mix contains things like sesame seeds, dried garlic, dried onion and salt — but poppy seeds are the problem. Poppy seeds are banned in South Korea because they are narcotic-related items, according to the airport. The ban is not new but travelers have said that airports are now cracking down on the seasoning mix. The seeds are also banned in a number of other countries, including Saudi Arabia and Singapore. The poppy plant is used to make drugs like heroin and morphine, although the seeds don't contain any opiates. However, the country worries that the seeds could be contaminated by opiates. In fact, in the US, members of the armed forces have been advised not to eat products containing poppy seeds in case they affect the results of drug tests. Drug tests can be very sensitive but experts say that it would be almost impossible to eat enough poppy seeds to feel any narcotic effect.