It’s got to be ham and cheese. No matter where you go, usually two out the three will be excellent, so a good sandwich is easily available
France - Amazing bread, amazing cheese, good ham
Spain - Crap bread, reasonable cheese, world class ham
UK - crap bread, world class cheese, good ham
Germany - world class bread, good cheese, amazing ham
America - bread that has to be called cake in other countries because of the sugar content, homogenised dairy product, and chlorine-washed minced pork-amalgam