Wow, it's always amazing to me how the law of unintended consequences (with capitalistic incentives acting as the Monkey's Paw) strikes everytime some well-intended new law gets passed.

As someone who is allergic to sesame, that is insanely annoying.

I don't like the opposite any more though, i.e. commercial food being effectively limited to the lowest common denominator of allergens and other dietary as well as religious restrictions. I see that happen a lot more than this one example and it doesn't even need any laws to cause it.