Thinly slice the sausages and place them in a large salad bowl. Add the sliced red onion, pickles, and grated cheese.
In a small bowl, whisk together the white wine vinegar, vegetable oil, and mustard. Season with salt and pepper to taste.
Pour the dressing over the sausage mixture. Toss well to ensure everything is evenly coated.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld. Before serving, stir in the chopped parsley.
Serve the Wurstsalat chilled or at room temperature as a hearty appetizer or main course.
Enjoy your meal!