Boil the eggs until they are hard-boiled, then let them cool.
Peel the eggs and chop them into small pieces.
In a bowl, combine the chopped eggs with mayonnaise, Dijon mustard, sesame oil, and salt. Mix well until everything is evenly combined.
Spread the egg mixture onto slices of bread to create the sandwich.
Cut the sandwiches into halves or quarters and serve.
