Amount of Protein. If you often cook beef roasts for dinner, you’ll get between 29 and 36 grams of protein from 4 ounces of cooked beef round or chuck roast. Sirloin steak is equally as rich in protein. Four ounces of broiled top sirloin offer 34.5 grams of protein. You’ll also get a lot of protein from beef ribs. A 4-ounce serving of roasted beef ribs has 30.5 protein grams. If you prefer beef liver, a 4-ounce cooked portion offers about 30 grams of protein. Even ground beef gives you more than 29 grams of protein in a 4-ounce cooked portion.