01 -
Boil the eggs for 10 minutes until hard-cooked, then transfer to cold water to cool completely.
02 -
Peel the cooled eggs and mash them in a mixing bowl until roughly smooth.
03 -
Incorporate sugar, salt, ground black pepper, milk, and Japanese mayonnaise into the mashed eggs, stirring thoroughly to achieve a creamy consistency.
04 -
Evenly spread softened unsalted butter onto each slice of the milk bread.
05 -
Distribute the egg mixture over two slices of bread, then cover with the remaining slices to form sandwiches.
06 -
Cut each sandwich in half and optionally garnish with thinly sliced chives before serving.