We we had a pretty good grip on our peanut allergy till DGS4 reacted to "something" friday. We figured out that it was sesame seeds. I have learned they are related to the peanut family. Going to retest for these but until then, where do these things "hide". He reacted to a hamburger bun so that was easy and we read everything but I know they are not one of the focus allergens so what are my big cautions???