Holidays with Heinen’s | The Perfect Prime Rib So what exactly is a perfect prime rib, anyway? Whether you buy prime or select, fresh or dry-aged, corn fed or grass-fed, if you don’t cook it right, it won’t be good. December 18, 2017 Barrington Eats/Christmas/Cooking/Cooking with Heinen's/Heinen's 4PM Panic/Heinen's Grocery/Holidays/Recipes/Things to Do