Vegetable salad

Peel the potatoes, steam, let cool. Cut potatoes, carrots, apples and cucumbers into small cubes, mix and season with sauce. Pour half a glass of hot water over the skin of apples and cucumbers, boil for 15-20 minutes, then strain the decoction and besiege. For the sauce, mix the yolk with horseradish and salt, beat, gradually adding vegetable oil. At the end of the whipping, add a decoction of apple skin and cucumbers.