Sirloin Tip Roast - approx. 4.6 lbs. These premium Sirloin Tip Roasts are grass-fed. A lean and flavorful roast, our grass-fed sirloin tip roast tastes great grilled, braised, or roasted. Especially well suited for slow cooking, this cut can be an economical prime rib if you treat it well! No hormones, antibiotics or GMO feed!