Prepare the sauce. In a bowl, add all the ingredients – sour cream, boiled egg yolks mashed with a fork, crushed garlic, mustard seeds, paprika, salt. Mix thoroughly to get a homogeneous mass. I will stop at sour cream, it should be thick so that the spoon will stand, at least, hang it in gauze overnight. Or take less in weight so that the salad can keep its shape. You can add mayonnaise or yogurt.