Avocado and Egg Spread Sandwich

Slice the celery thinly. Cut the avocado in half, remove the pit, then carefully scoop out the flesh with a spoon, and cut into approximately half-centimeter cubes.

Cut the hard-boiled eggs in half, carefully scoop the yolks into a bowl, and mix with a fork with the mustard and lemon juice. Add mayonnaise and mix again.

Dice the egg whites, then gently fold them into the egg yolks.