Wash the vegetables and cut then in 1/2 inch cubes. Seed the bell peppers the tomatoes and cut them in 1/2 inch pieces. Finely slice garlic and black olives. Chop the onions (coarsely) and warm the olive oil in a saute pan at medium heat. Add all the ingredients. After 5 minutes, reduce the heat and add salt, pepper and thyme. Cover and let the dish simmer for about 20 minutes, stirring occasionnally. Serve hot, as an accompaniement to rice and meat or simply with eggs if prepared for a brunch. You can sprinkle piment d'espelette before serving to add a Basque country flavor.