How do you manage introduction of other seeds when the patient has never been exposed and has a sesame allergy?

Since there is considerable cross-reactivity between other seeds, but also with nuts and other foods, one needs to do allergy testing in a sesame seed allergic patient before introducing other seeds. That can be either with prick skin testing or in-vitro testing. However, if one is negative with one method of testing, the seeds should be tested with the other technique before concluding there is no allergy. At that point the patient should be able to eat those "double negative" seeds, However, e...