White Castle

SHERRY: Great. Oh, of course this does leave you a sad little orphan.
CHRISTOPHER: Oh, that’s okay. I’ll have one of my patented White Castle bachelor dinners.

White Castle, a hamburger restaurant chain in the US operating in 13 states, mostly in New York and the Midwest. It is credited as the world’s first fast-food hamburger chain, founded in Wichita, Kansas, in 1921 by Walt Anderson and Billy Ingram. Anderson is credited as the inventor of the hamburger bun, while Ingram’s business savvy helped popularise the hamburger. The chain is still owned by the Ingram family.

In real life, the nearest White Castle restaurant to Litchfield is in Nanuet, New York, almost two hours drive away. Possibly Christopher is simply using the name to mean he’ll be grabbing a burger somewhere, or eating at a chain restaurant.