Prepare two bowls of iced water
Bring a medium pot of water to a boil and put in all 8 eggs
Reduce the heat to a simmer and boil the eggs for 7 minutes
Remove two eggs with a slotted spoon and place them in an ice bath
Boil the rest of the eggs for 3 more minutes, then remove the eggs with a slotted spoon and place them in the other ice bath
Peel the eggs, making sure you keep the soft-boiled and hard-boiled eggs separate
Separate the egg yolks and whites of the hard-boiled eggs
Put the egg whites on a chopping board and roughly chop
Put the egg yolks in a large mixing bowl and mash them with a fork
Add the sugar, salt, and mayo, and mix until smooth
Add the egg whites and spring onion, then mix until well combined
Cut the crusts off the bread
Place two slices of bread down and divide the egg mixture between the two, leaving a little egg mixture
Place the soft-boiled egg in the center of each and cover with the remaining egg mixture
Top with the two remaining slices of bread
Wrap the sandwiches in baking paper, or simply slice and serve
