In a pan of boiling water cook the baby potatoes for 10-12 minutes until cooked through. During the last 5 minutes of cooking time add the broad beans to the pan. Drain and leave to cool slightly.
Meanwhile in a pan cook the steaks for approximately 8 minutes (for medium done). Take half the watercress and arrange over two plates.
Chop the other half of the watercress and mix with Creme Fraiche and horseradish sauce. Add this mixture to the cooked potatoes and broad beans and serve spooned over the watercress.
Serve the cooked beef sliced on top of the watercress salad with chunks of crusty bread.