put a quarter of the onion and half the chilli in a pestle and mortar and mash to a rough paste.Scoop the flesh from advocado and the garlic into a bowl ,if you have a small mortar

roughly mash the flesh with fork and lime juice as you go along, then poor im rest of lime juice ,onion ,chilli and coriander .Season with salt and pepper .Add the tomato and stir .Serve with tortilla chips.

For a special treat , leave out tomato and add pomegranate seeds instead.