Why don’t Americans put butter on their sandwiches? | Arwa Mahdawi

When it comes to spreadable fats, there's an ocean of mayo between Europe and the US - and my wife is drowning in it

Sometimes it takes a random TikToker to make you realise you don't know your wife quite as well as you thought. In my case, the revelation came via an American influencer in Paris called Amanda Rollins. She went viral recently thanks to a video in which she earnestly explained that the French do this really weird thing: they put butter on sandwiches.

What they do, it's like a classic sandwich: it's ham, cheese and butter. Literally, just swab it on - no mayonnaise, no mustard, just butter," she says in the video. And listen, I know you might be thinking that sounds gross. It's actually so good."

Arwa Mahdawi is a Guardian columnist