Make roasting easy with this Mustard Crusted Roast Beef. Simple to make, big on flavour and makes great British beef taste even greater – the perfect roast dinner.
1.Take the joint out of the fridge 1 hour before cooking to bring it up to room temperature. With paper towel, pat beef dry. Rub 1 tbsp oil over both sides of beef and season with salt and pepper. Preheat the oven to 230ºC/gas mark 8. Weigh the beef to calculate the exact cooking time – for medium, cook for 15 minutes per 454g plus an extra 20 minutes; for well done, cook for 20 minutes per 454g plus an extra 20 minutes.
2.In a cast iron skillet, heat 1 tbsp oil on medium-high. Add beef and sear on all sides until browned, 2 to 3 minutes per side. Remove from heat, place the beef in a large roasting tin. Add the flour and mustard together in a bowl, mix well then rub all over the joint. Season with freshly ground black pepper.
3.Roast the joint for 20 minutes, then reduce the oven temperature to 200ºC/gas mark 6 and cook for the remaining calculated cooking time. Baste the joint every 30 minutes with the pan juices.
4.An hour before the end of the cooking time, put the onions, shallots and garlic in the roasting tin around the meat. Scatter over the sprigs of thyme, reserving a few sprigs for garnish. Toss the vegetables in the pan juices to coat and drizzle them with a little sunflower oil if necessary.
5.When the beef is cooked to your liking, transfer it and the roasted vegetables to a serving platter and cover loosely with foil. Let the meat rest for 20 minutes. Carve and serve with the roasted onion, garlic and shallots, plus veggies and trimmings of your choice. Garnish with the reserved thyme.