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.

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.