Mix the red wine vinegar with olive oil, salt and pepper.
Gently add the chopped garnishes to the vinaigrette and season to taste.
Prepare the salad
Toss the boiled mussel meat into the dressing
Remove the outer leaves of the Boston lettuce and wash in cold water.Peel and cut the boiled potato into thick slices. Cut the boiled green beans into sticks.
Gently open the Boston lettuce leaves, insert the boiled potato, and green beans in between.
Spoon the marinated mussels on top. Serve the dressing on the side.