Put the boiled beef with the soup greens, salt and pepper in a saucepan and cover with water. Bring to the boil and then let simmer for approx. 2-2.5 hours. Let the meat cool in the broth, preferably overnight.
For the vinaigrette, finely dice the raisins, tomatoes, cucumber, capers and onion. Mix everything with the remaining ingredients to make a vinaigrette and season well.
Cut the meat into thin slices. Spread the vinaigrette on top and let everything steep in the refrigerator.
Just before serving, sprinkle the egg and chives over the top.