Peel and finely chop the onion. Coarsely chop the canned tomatoes. Heat 1 tablespoon of oil in a saucepan. Sauté onion and rice for about 2 minutes. Add tomatoes with juice and stock and bring to the boil. Cover and cook over low heat for about 25 minutes.
Wash the thyme, dab dry and pluck the leaves from the stalks. Wash the meat, dab dry and season with salt and pepper. Heat 2 tablespoons of oil in a large frying pan. Fry the fillets over medium heat while turning for 8-10 minutes.
Wash, clean and chop the tomatoes. Cut olives into rings. Clean, wash and cut the fennel into fine pieces. About 5 minutes before the end of the cooking time, add fennel, tomatoes, thyme, except for something to garnish, and olives to the rice, season with salt and pepper.
Cut the chicken fillets into slices and arrange on the tomato rice. Garnish with thyme and sprinkle with ground black pepper.