Cut the avocados in half, remove the stone and scrape out the flesh into a bowl.
Roughly chop the tomatoes and the onion. De-seed the chilli. Put these into a small food processor together with the coriander and add the juice of one lime and half of the avocado flesh.
Whizz until you get a textured paste. Add the remaining avocado and whizz for a few seconds until the desired texture is achieved ( or use a fork to mash for a more rustic version).
Taste it. Season with salt and pepper to your liking and more lime juice if needed.
Serve it fresh!