Peel the avocados, halve them lengthways, remove the stone and thinly slice them (or you can cube them if you prefer). Slice the tomatoes (you can use sun dried tomatoes for a more intense taste), peel and slice the onion and finely dice the chilli.
Lay the tomato slices on a serving plate, salt them to taste and drizzle a little of the olive oil over. In a large salad bowl, combine the avocado, onion, chilli, garlic, remaining olive oil, lemon juice and salt and freshly ground black pepper to taste. Mix these well then turn the salad over a few times with your finger tips to coat everything well in the oil and lemon juice. Heap the avocado-onion mix over the tomatoes and chop some fresh parsley over the top. Serve as a starter, a snack or as a main course with cold meat.