Cook the whole grain rice in a saucepan with three times the amount of water for about 35 minutes, drain off any remaining water.
In the meantime, wash and clean the vegetables and cut into bite-sized pieces. Peel and dice the onions and sauté in a pan brushed with oil. Add the vegetables and sauté them. Pour approx. 250 ml water into everything and cook for about 15 minutes. Season the vegetables with vegetable broth.
Dice the tomatoes and fold them into the vegetables. Fold in the rice and sprinkle with chopped herbs.