Clean and wash the string beans
Peel the potatoes and cut them in wedges. Usually from one potato you get 6 slices.
Dump the potatoes and the string beans in boiling water. Cook for about 7-10 mins. Taste one of the string beans... they should be Al Dente.
Remove the potatoes and string beans from the hot water and put them under cold water.
Place in a bowl, add EV olive oil, the vinegar and the onion, finely sliced.
Add salt and pepper as desired and serve!