Here in Norway we have the infamous "E6 ham", named after the European route[1] the trucks drive through Sweden and into Norway.<p>The trick used there is exploiting that if you export something to have it undergo modifications abroad and then subsequently re-import it, the import rules are different and you typically do not pay the normal tariffs.<p>Now, in Norway we don't have a lot of tariffs in general, but we do have some significant ones on food and such, including cured hams, to protect local producers.<p>So, someone clever figured out how to exploit this. Buy a suitable pig carcass in Spain, transport it to Norway and import it as a whole pig carcass which has a low tariff, then have the trucks do a U-turn right across the border and drive back to Spain, unopened. Only fresh fish have export tariffs here in Norway, so nothing to pay there.<p>Back in Spain you have the pig get processed into your Serrano or Iberico cured ham[2], and then transport it back to Norway. When it comes back you point to the original import declaration and claim the cured ham is a modified pig, and thus not pay the tariff for cured hams.<p>[1]: <a href="https://en.wikipedia.org/wiki/Jam%C3%B3n" rel="nofollow">https://en.wikipedia.org/wiki/Jam%C3%B3n</a><p>[2]: <a href="https://en.wikipedia.org/wiki/European_route_E6" rel="nofollow">https://en.wikipedia.org/wiki/European_route_E6</a>