Bring a pan of water to the boil, then add three of the eggs. Cook for 3 minutes, then add the final egg and cook for another 6 minutes, keeping track of which egg was added last.

Once cooked, add the eggs to iced water to stop them from continuing to cook.

Peel the 9-minute eggs, then cut them in half and separate the yolks from the whites. Add the yolks to a bowl and mix with the mayonnaise and salt.

Roughly chop the whites, then mix them with the yolks and chives.

Peel the 6-minute egg and set it aside whole.

Add the egg mixture to one slice of bread, then create an indent in the middle for the whole egg to sit in. Carefully top with the other slice of bread, wrap in baking paper, cut in half, and enjoy!