how do i cook beef in oven its a small 1.5lb sirloin roast, how long for what tempYou\'ll need: 1 3-5 lb roast 2-3 cloves of garlic 2 sprigs fresh rosemary 2 sprigs fresh thyme 2 tsp kosher salt several cranks of freshly cracked black pepper 3 Tbl olive oil Preheat oven to 350F Put all ingredients except the roast into the bowl of a food processor, and pulse several times until finely choppedYou can also chopped them, and whisk together by handDon\'t skimp the salt - the salt will work with the natural juices of the roast to form the crusty exterior Rub the garlic/rosemary mixture thoroughly over the surface of the roast, massaging it inInsert the probe of a meat thermometer into the very center of the roast Place in oven, and roast until you reach an internal temperature of 130F for medium rareFor each additional \'step\' of doneness, add ten degreesSo medium would be 140, medium well, 150, and well done 160 Pull from the oven when the thermometer reads 130Make a tent of foil and loosely cover the roastYou\'ll see carryover cooking increase the temperature another 5-10 degreesThat\'s fine - you planned on it Carve the roast on a cutting board or large platter to catch the juicesDon\'t waste those - they are delicious too! Use a spoon to drizzle the jus over the meat when you serve itOther related question