This simple roast is easy to master, and the mustardy crust is delicious, light and elegant. It’s easy, so get cooking! Using a small cheat (pre-cooking the spuds in the microwave) lets you enjoy the ease of one-pan roasting, while still getting super-crunchy potatoes.
Ingredients
Method
Preheat oven to 220°C fanforced (240°C conventional). Use a small sharp knife to score the silver skin of beef in parallel lines. Mix mustard powder, flour and allspice in a small bowl and season generously. Rub mixture all over beef then set aside for 20 minutes to marinate.
Cook potatoes in a microwave-safe bowl, uncovered, in the microwave on medium-high/70% for 10–12 minutes (depending on your microwave) or until tender. Allow to cool slightly, then put in a large bowl with vegetables, garlic and rosemary. Pour over ½ of the oil, honey and vinegar, and toss to coat.
Drizzle beef with the remaining oil, then put on a large oven tray along with veg mixture. Cook for 20 minutes, then reduce heat to 180°C and cook for a further 1 hour for medium. (Reduce cooking time by 10 minutes for mediumrare and add 10 minutes for medium-well done.)
Cover beef and veg loosely with foil for 20 minutes to rest, then carve beef into generous slices. Garnish with watercress. Serve with veg and gravy.