Mix the sour cream and horseradish to a homogenous dressing. Put aside. Dice the cheese finely. Make a dough of the mashed potatoes, flour, cheese, mustard and eggs. Form round pancakes, flatten them and fry in a hot mixed fat. Serve with horseradish sauce, mustard and chives. You can also grill lemon chunks on a dry pan, which will make it more fragrant, and hence adds a twist to the dish.
