I believe this aptly-called English *'delicacy' [originally] derived its name from one or more edible fillings being compressed or "sandwiched"Originally Posted by pennybarry
So it is like *sandwich? No sand in it.between two chunks or slices of bread (roughly proportionate in size). But you're right, Penny ... sand is not/never has been an "ingredient" ...
... unless inadvertently ... say, during a picnic on the beach!
