Peter Luger Steak House has been serving the finest USDA Prime steaks since 1887. The selection process is crucial and therefore is done only by members of the family who visit the wholesale markets on a daily basis. It begins with fresh sides of beef that usually come from the Midwest. The section of beef used is called the short loin. Only those cattle graded PRIME by the United States Agriculture Department are even considered. It is then important to examine the color, fat conformation and bones. The color must be pink with an even conformation of fat dispersed throughout. This is referred to as marbling. If selected, the loin is brought back to the premises of the restaurant where the dry aging process begins. The loins of beef sit in a temperature controlled cooler where air circulates around them. After the meat is properly aged, it is butchered and brought up to the kitchen for broiling.