Haha... I always wondered why people add sesame seeds on the burger buns. Turns out they do add some flavor and texture to the buns. They make the boring bun look interesting. The sesame seeds get toasted on baking and give a nice nutty crunch. The top of the buns looks interesting when topped with the contrast-colored sesame seeds. Just love these vegan sesame buns! They add a little bit of that extra appeal to the otherwise flat brown topped bun. But they do not make any considerable addition to the bun taste and flavor. You can always choose to omit it. Also, if you or someone in the family have a sesame allergy, you can substitute them with some poppy seeds or chia seeds.