Truss beef securely with string to keep its shape and season with salt and pepper. Pan fry beef on all sides until browned

Transfer to a preheated 200°C oven and cook for a further 15-20 minutes until medium-rare or cooked to your liking. Rest for 20 minutes before serving

Combine blue cheese and cream in a saucepan over low heat, stirring until blue cheese is nearly completely melted into the cream (there will be some small pieces of blue cheese visible). Season with black pepper and cool completely

Combine fennel, celery, apple, walnuts and coat in half the dressing. Slice beef into thick slices and serve with salad and remaining dressing