Prepare potatoes, eggs, mayonnaise, and strawberry jam.

Peel and cut the potatoes, then boil them with 1 pinch of salt for 15 minutes.

Mash the boiled potatoes with a fork.

Mix the mashed potatoes with 3 tbsp of mayonnaise.

Boil the eggs with 1 pinch of salt for 15 minutes.

Cool the eggs in ice water and peel them.

Mash the eggs with a fork.

Mix the mashed eggs with 4 tbsp of mayonnaise.

Spread the egg salad on one slice of bread.

Cover with another slice of bread and spread 1 tbsp of strawberry jam on top.

Spread the potato salad on the final slice of bread and assemble the sandwich.