Poached beef fillet with watercress & walnut salad - Good Food Middle East

Ingredients

• 1l stock (from a cube is fine)
• 1 large onion
• 1 head fennel, sliced
• 1 large carrot, sliced
• 2 bay leaves and 2 sprigs rosemary
• 500g joint beef fillet
• 100g bag watercress
• 4 tbsp extra-virgin olive oil
• 1 tbsp balsamic vinegar
• 1 tsp Dijon mustard
• 50g chopped walnuts