Place the cheese in a large bowl and break up with a fork. Cut the salami into thin strips.
Finely dice the gherkins. Drain and chop the cocktail onions. Chop the walnuts.
Stir salami, gherkins, onions and walnuts into the cheese, together with the horseradish, yogurt, mayonnaise, salt and Tabasco sauce.
Adjust the seasoning.