Brush the potatoes vigorously under water. Heat the oil - preferably in two large pans. Fry the potatoes for about 30 minutes, turning them frequently. Season with coarse salt
For the dips, stir cream cheese, quark and mineral water until smooth. Season to taste with salt and pepper. Divide the cheese cream into three portions
Wash the dill and chives, shake dry and chop finely. Clean and wash the radishes and cut them into thin sticks. Cut salmon into fine strips
Fry the diced ham crisply without additional fat, let it cool down. Mix one portion of cheese cream with salmon and dill, the 2nd portion with radishes and chives. Mix the 3rd portion of cheese cream with horseradish and ham. Arrange potatoes and dips. Garnish with parsley if desired.