By Max Halley and Ben Benton
These are a piece of piss to make.
Put the sliced onion in a bowl, squeeze over the lime, add the salt and cover with clingfilm. If the lime is hard, roll it firmly on a board with the flat of your palm to break down the internal structure of the lime and give you more juice when squeezing.
Mix well, cover with clingfilm and allow to sit for at least 3 hours, or up to a week. If you’re playing the short game, shake the b