Dice the onion and sautee in the olive oil until translucent then add the garlic and sautee for one more minute.
Add the water and bring to a boil.
Cube the potatoes and add to the soup.
Chop the leeks and add to the soup.
Add the salt.
Cook for one hour or until the potatoes are cooked through. You can add more water if you like a brothy soup or you can use a hand blender to make a creamy soup.