the.com/key lime pie

means A custard pie made with the tart juice of Key limes, egg yolks, and sweetened condensed milk, usually set in a graham cracker crust.

from Named for the Key lime, the small, fragrant, intensely tart citrus that grows in the Florida Keys — likely brought to the Americas by Spanish settlers from Southeast Asia. The pie itself owes its existence to sweetened condensed milk, patented in the mid-1800s, which let cooks without reliable refrigeration or fresh dairy whip up a stable custard just by mixing it with egg yolks and acidic lime juice, which thickens the filling without baking. The exact origin story — often pinned on a Key West cook or sponge fisherman — is more legend than documented fact, but the marriage of canned milk and local limes is real enough.