Roughly chop the onion and cucumber and put it in a mincer together with vinegar and water and blend into a coarse mixture. However, you can also just chop it very finely.
Then add spices (a pinch of salt and pepper to taste, sugar, sweet paprika) and mayonnaise, ketchup and chopped chives.
Blend or mix everything together and serve with salad. It can also be stored in the refrigerator.