Preheat the oven to 240 °C. Place the tomatoes on a baking tray with the cut side facing up. Drizzle with 1/5 of the olive oil and sprinkle with a tiny bit of garlic, salt and black pepper, then place in the oven for 1500 cmin until they turn dark brown.
Meanwhile, skewer the chiles in order on a fork and hold over an open gas flame for about 3 min until they blister around it. Peel off the skin and finely chop the flesh. Or place the chiles under the hot broiler for 5-6 min, meanwhile turn once to the other side.
Cut the tomatoes into cubes and put them in a baking dish with the chopped chiles, the rest of the garlic and olive oil, the red onion, the juice of one lemon, coriander and a little bit of pepper and salt.
Keep covered in icebox until ready to eat – 5 days at most.
Tip: Always use organic lemons for cooking, if possible!