Finely chop the tomatoes and coriander (stalks and all) and place into a large bowl.Peel and finely chop the onion, deseed and finely chop the chillies, then scrape into the bowl. Peel and finely grate in the garlic.Squeeze in the juice from 1 lime, add 2 tablespoons of extra virgin olive oil, and mix well. Season to taste with sea salt, black pepper and more lime juice, if needed.Serve straightaway or cover and set aside for a few hours to let all those flavours develop.