Korean Style Potato Salad (Gamja salad: 감자샐러드)

Full recipe: http://www.maangchi.com/recipe/gamja-salad Korean style potato salad! Many people have asked me to post the recipe for this, and here it is: it's called gamja-salad in Korean or simply "potato salad" in English. Cold, smooth, slightly sweet mashed potatoes, almost like ice cream, with crispy cucumber. Delicious!