Ingredients
Method
1.Preheat oven to moderately slow, 160°C. Line a baking dish with baking paper.
2.Brush beef with mustard and 1 tablespoon oil. Roll in peppercorns and season with salt.
3.In a large frying pan, heat 1 tablespoon olive oil on high. Sear beef for 10 minutes, turning on all sides, until evenly browned.
4.Toss potato and mushroom in remaining oil in pan. Arrange separately in pan. Scatter thyme and garlic over, then season.
5.Place a small greased rack over vegetables in pan. Place beef on rack. Bake for 1 hour for medium or until cooked to your liking.
6.Remove the beef and mushrooms from pan. Rest for 15 minutes, loosely covered with foil. Increase oven to very hot, 220°C. Roast potatoes for a further 15 minutes while beef is resting.
7.In a small bowl, combine crème fraîche and horseradish cream, then season. Serve beef in thin slices with vegetables, horseradish and watercress.
Note
- Add some cherry tomatoes to the dish for the last 15 minutes, if desired.