Ingredients

Steps

• Preheat the oven to 220°C.
• Heat vegetable oil in a roasting tin and sear the beef for 4 minutes until browned.
• Rub a mixture of mustard powder, salt, and pepper over the beef.
• Roast the beef for 30 minutes until it reaches 60°C for medium.
• Remove the beef from the oven and rest for 15 minutes.
• Fry sliced onions in butter and olive oil for 10 minutes until golden.
• Combine the horseradish, vinegar, mustard, sugar, and cream in a bowl.
• Assemble the rolls with sliced beef, pan juices, onions, lettuce, and creamed horseradish.