Sugar and lemon juice, banana and nutella, even ham and cheese - these are ingredients that most people would choose as their go-to fillings on Pancake Tuesday. However, some more unusual pairings are combined on Shrove Tuesday around the world. Sour cream and caviar is a favourite in Scandinavia, peanut butter and ice cream is enjoyed in the USA, while Coco Pops and cream is much-loved in Southern Europe. Arguably the most bizarre combination, however, is found in Eastern Europe - where tomato ketchup and mustard are mixed and spread across a pancake. Very strange indeed...