My kids are also not allergic to sesame. They have peanut, treenut and shellfish allergies. Teppan Edo was extremely helpful and careful accomodating their allergies. Their food was prepared and served first. The chef repeatedly clarified their allergies before continuing with another ingredient. When it came time for the sesame seeds, he asked if anyone at the table had a sesame allergy, then when no one responded, he asked everyone again.
Have the allergy noted on your ADR and remind the hostess, server and chef when you arrive. The great thing about Teppan Edo is that you can see your food being prepared and be sure it's safe.