1. Wash and peel the potatoes.
2. Bring a large pot of salted water to a boil over high heat.
3. Once boiling, add the peeled potatoes to the boiling water and cook over medium heat for about 20 minutes. They should be tender at the end of cooking.
4. After this time, drain the cooked potatoes in a colander, then let them cool on the side.
5. Meanwhile, cut the slices of smoked salmon into thin strips.
6. Peel and finely chop the shallot.
7. Cut the yellow lemon in half and squeeze it to extract its juice. Remove any seeds if necessary.
8. In a container, mix the olive oil with cold water and balsamic vinegar. Season with salt and pepper to taste.
9. Cut the cooled potatoes into thin slices. Pour them into a salad bowl, then add the strips of smoked salmon, chopped shallot, low-fat cottage cheese, lemon juice, chopped dill, and balsamic vinaigrette sauce. Mix well so that the potatoes are well coated with the sauce. Adjust the seasoning with salt and pepper if necessary. Keep this salad refrigerated until ready to serve.
10. Serve this chilled potato salad on plates, garnished with one or two slices or wedges of untreated yellow lemon per portion. Enjoy it as a main dish.