Delicious Japanese potato salad

I didn't plan my salad menu for today. Therefore I was looking around my kitchen and refrigerator. Good, I found some ingredients to make this simple yet tasty potato salad.
Ingredients:
2 potatoes
4 slices of onions. Chop into fine pieces
1 cucumber
1 hard boiled egg

Dressing:
Mayonnaise (your preference)
Pepper (a pinch)
Salt (a pinch)

Method:

1. Cut the cucumber into round and thin slices. Add 1/2 teaspoon of salt and leave it for about 10-20 minutes.
2. Squeeze the excess water from the cucumber.
3. Steam or boil the potatoes until soft. Remove the skin and mash them.
4. Add salt, pepper, mayonnaise, chopped onions, hard boiled egg and cucumber.

Here you are. Some people like to add ham and carrot. You can even add this salad into your sandwiches.
Hope you like it.