Add the eggs to a saucepan and fill with cold water. Bring water to a boil and once the boiling point is reached, boil eggs for 8 minutes.
Prep the ingredients per the instructions above.
Take the eggs out of the water and run them under cold water to cool.
Lightly toast the bread.
Peel the eggs, chop them, and add them to a bowl. Mix the eggs with onion, mayonnaise, dill, mustard, and lemon juice. Taste for seasoning, adding more dill, mustard, and/or lemon juice as necessary, and salt and pepper to taste.
Layer the bread with spinach and egg salad.
Serve: Cut in half and enjoy with pickles, chips, and sparkling water.