Preheat oven to 350 ℉.
Crack eggs into a loaf pan.
Place loaf pan in the center of a 13x9 inch casserole dish.
Add enough water to the 13x9 inch casserole dish so it comes up to the level of the eggs in the loaf pan.
Place in the oven and bake for 1 hour, or until egg whites and yolks are cooked through.
Remove from the oven and allow eggs to cool to room temperature, about an hour.
Separate egg yolks from the egg whites. Place egg yolks in a mixing bowl.
Use a fork to mash the egg yolks.
Add mayonnaise, mustard, salt, pepper and diced pickles to the mashed egg yolks.
Stir to combine.
Chop egg whites into small pieces and add to the egg yolk mixture.
Stir together until you have a creamy mixture.
Add more mayonnaise if mixture seems too dry.
Taste and season with additional salt and pepper if needed.
Spread egg salad on toasted wheat bread. Top with lettuce and tomato if desired.
Top with another slice of toasted bread and serve.