Pizza was invented in Italy, popularised in America, and Norwegians now eat more of it than anyone else. Since its origins in Naples, the food has become a global favourite with each region coming up with toppings to suit their particular taste. The standard pizza, for those who don’t know, is round and flat with cheese and tomato baked on top of a bread base (at least, the base is usually bread – vegetarians should avoid Googling “porco pizza”).