Dry Aged Prime Rib Bone-In (45+ Days) | USDA PrimeHow To Cook Prime Rib For detailed instructions, read our blog post on how to cook a boneless prime rib. This is one of the coolest products Meat N' Bone sells; a 45 60 day Dry Aged Prime Rib. The Prime Rib primal cut is where we find the most tender, flavorful and desirable steaks in a steer cow. In layman's words, the Prime Rib is where the flavor is at. The Prime Rib is the undisputed KING of large cuts of beef. Cook this dry aged prime rib as a