Rinse and dab the tomatoes and cut into quarters. Chop the green of the spring onions. Chop the basil.
Fry the tomatoes in a frying pan with 2 tbsp olive oil, sprinkle with a pinch of sugar, caramelize it and remove the tomatoes from the frying pan and put them in a large enough bowl. Season with juice of one lemon, salt and pepper, stir in onion leek and basil.