My favourite sandwich is one I often make myself and have eaten since I was a kid.

You take the crusts from the ends of a loaf of bread and butter them.  Then use a full packet of salt and vinegar crisps (chips),  slice up some pickled onions and some pickled beetroot and smother the whole thing with HP brown sauce, or use ketchup if you prefer.

Stick the other crust on top and squash it all down. 

Totally delicious, you have to try it :-)