Add the peeled and cut potatoes, chopped leeks, and salt to a large saucepan and cover it with cold water.
Bring the water to a boil on medium high heat and cook until the potatoes are fork tender.
Drain the cooked leeks and potatoes and set them aside.
Heat the olive oil on medium heat, and once warm, add the thinly sliced leeks to it.
Cook the leeks until they turn golden brown, stirring frequently to avoid overcooking them. Be mindful not to overcook the leeks, as they may become bitter.
Once ready, add the boiled potatoes and leeks to the caramelized ones and mix well.
Next, using a potato masher [or ricer], roughly mash the potatoes to your desired consistency.
Finally, taste for seasoning, and if needed, add more salt.
Serve immediately with your favorite main course, or pair it with something different, like this delicious German Goulash!