The term 'sliders' originated in the 1940s during the Second World War. My Grandfather was a young man of 20 then and had enlisted in the Merchant Marines. For decades, I heard him refer to the burgers my Grandmother would fry up in a pan as a slider, referring to the grease that would build in the pan as the beef seared. I only figured out what they were when we all piled in the car and headed for the Key City Diner in Phillipsburg, New Jersey, a haunt for my grandparents during the War when my Grandfather would get leave. He always ordered a plate of sliders, or "greasy little hamburgers that after only two bites would slide right down!"