Tamago sando! The hot dog bun version is a little odd to me.

the hot dog bun is a perfect carb vessel for “salad”-like fillings. unlike traditional bread slices, the hot dog bun has fewer open sides, and acts more like a cup to hold the contents. though it may look a bit odd, it truly is peak salad sandwich performance.

I just want those ham and cucumber sandwiches in the US. That's the first thing I get whenever I land in Japan.