Soak the Borlotti beans overnight and slowly simmer in salted water until soft. Dice shallots and sauté lightly in olive oil. Cut the dried tomatoes into fine strips. Mix the drained beans with the tomatoes and shallots.
Mix the broth, mustard, salt, sugar and balsamic vinegar into a vinaigrette and mix with the salad. Add the cut basil before serving.
Halve the char and briefly heat the individual halves in a pan with hot butter and serve on the salad (1/2 char per person). You can add some freshly ground black pepper on top.