Roast Beef With Caramelized Onions - cooking recipe

Ingredients

1/3 cup olive oil
1 (3-4 lb) standing rib roast, at room temperature
4 None large red onions, unpeeled, quartered
1 tbsp brown sugar
1 tbsp balsamic vinegar

Preparation

Preheat oven to 425\u00b0F. Rub 2 tbsp oil into beef. Season. Place on a rack in a roasting pan. Roast for 20 mins.
Toss onions with remaining oil, sugar and balsamic vinegar. Arrange around beef in pan. Reduce heat to 350\u00b0F. Roast for around 40-50 mins, for rare (140-150\u00b0F) to 55-60 mins for medium-rare (160\u00b0F). Let rest, covered loosely with foil, for 15-20 mins. Carve.