Keens Steakhouse is known as the last bastion of the mutton chop, a dish that has fallen entirely out of favor in the rest of the city's chophouses. According to. Read the Keen's Mutton Chops vs. Luger's steak discussion from the Chowhound food community. Crockpot Mashed Potatoes Recipe. Sideburns, sideboards. Nineteenth-century sideburns were often far more extravagant than those seen today, similar to what are now called mutton chops.