Mash sardine and mix with butter, salt, curry and pepper. Keep aside

Mix the mayonnaise and ketchup together

Cut off the crusty end of the bread.

To the first slice, spread the ketchup-mayo mix. Place two lettuce leaves, 3-4 slices of tomato and 2 slices of cucumber.

Spread the sardine mixture and cover it with another bread

Repeat it (add ketchup-mayo mix followed by lettuce, tomatoes and cucumber. Then cover with the last slice of bread)

Hold together with a toothpick