Peel the potatoes and cook them in a little salted water until they are soft. Bring the rice to the boil in the vegetable stock, then turn the stove down to the lowest level and cover and let stand for about 30 - 35 minutes.
Clean the mushrooms, cut them into small pieces and sweat in the oil together with the crushed garlic clove. Season with pepper and paprika and stir until the liquid has evaporated from the mushrooms.
Then add the potatoes and rice and puree everything together. Possibly add seasoning!