Pluck the pretty smaller leaves from the prayers and put them aside. Cut the larger tubers in half. Cook the tubers in boiling salted water for 15-20 minutes until they are soft.
In the meantime, press the juice of 1 clementine into a large bowl. Add 1 tablespoon of olive oil and 1 good shot of red wine vinegar. Peel the remaining 3 clementines, cut them crosswise into thin slices and arrange on plates.
Pour the tubers into a sieve and rinse briefly under cold water. As soon as you can touch the tubers, remove the shells. Halve or slice a few of the tubers. Pour dressing over them. Season with sea salt and pepper. Add tarragon and the beet leaves that have been set aside and lift everything through. Spread on the plates, crumble goat's cheese and walnuts on top. Drizzle with a little olive oil.