Fry an egg (make sure you cook the egg yolk well) or boil it but later, do crush the boiled egg and add 1 Tb of mayonnaise to it with 1 pinch of salt and 2 pinch of black pepper.

Mayonnaise 2 slices of bread

Wash the cucumber thoroughly.

Do not remove the skin of cucumber (this part is optional)

Cut the cucumber in circular shape (2D)

Layer the slices of cucumber on one slice of bread

Overlay the egg after layering cucumber

Now drizzile ketchup over (optional)

The place the mayonnaise slice of bread over the layered stuff.

Now cut the sandwich in any way you like and enjoy :)