The 24th of April is a good day to challenge all your preconceptions about what Pigs-In-A-Blanket are.
Brits may not have any, because they may not know what Pigs-in-a-Blanket are. They actually might, though…
North Americans will think they know exactly what Pigs-in-a-Blanket are, but may found out that their next door neighbour’s definition is completely different from theirs.
All modern ideas will probably be different from what the definition used to be in the 1800s.
And just about everyone will have a different guess as to what exactly should the plural be. Have a look: Pigs-In-A-Blanket .