Beef rib steak (famously known as bone-in ribeye or prime rib steak) is widely considered the king of kosher steaks due to its deep, buttery beef flavor and incredible tenderness. Sourced from the rib primal section, its hallmark feature is a high concentration of white intramuscular fat lines—known as marbling—along with a rich, melt-in-your-mouth fat core called the "ribeye cap."