National Prime Rib Day is observed on April 27, 2018. It's a day to enjoy one of America's favorite steaks. A prime rib, also known as standing rib roast, is a cut of beef from the primal rib, which is one of the eight primal cuts of beef. A slice of standing rib roast will include portions of the so-called "eye" of the rib as well as the outer, fat-marbled muscle known as the "lip" or "cap".
The traditional preparation for a standing rib roast is to rub the outside of the roast with salt and seasonings and slow-roast with dry heat. In the United States, it is common for barbecue purists to apply smoke to the uncooked rib roast at low heat for two to three hours before dry roasting. (With material from: Wikipedia)