Prepare the vegetable base. Heat the butter in a deep frying pan. Add the carrots and onions. Fry for 7 minutes, stirring constantly. Then add the mushrooms and continue cooking for another 10 minutes.
Combine the mushrooms with rice and finish cooking the pilaf. Add the rice to the vegetables, salt, season with pepper, sprinkle with cumin and add garlic. Mix thoroughly. Pour water into the pan, cover with a lid and wait until it boils. Reduce the heat to low and leave to simmer for 30 minutes.