Ingredients
Method
1.Preheat oven to 220°C or 200°C fan. Rub 2 tablespoons oil, salt and pepper over surface of beef. Place on a roasting rack in a heavy flameproof baking pan. Roast for 20 minutes.
2.In a bowl, toss onion with remaining oil, sugar and balsamic vinegar. Place around beef in pan. Reduce heat to 180°C or 160°C fan and roast for 40-50 minutes, depending on size, for rare. Allow an extra 15 minutes for medium-rare. If using a meat thermometer, rare will register at 60°C-65°C and medium at 70°C.
3.Transfer beef to a warm plate and cover loosely with foil. Rest for 15-20 minutes in a warm place before carving.