Wash the potatoes under running water, rubbing the skin to remove any dirt and debris. Then peel the potatoes and keep in a bowl with cold water. u003cbr/u003eAfter all the potatoes are peeled, cut into 1-2u0022 cubes and allow to sit in the water for a while, it'll help take away some of the starch. Although, in this recipe you'll want to have the starchy water, it's what aids in the thickening.