Pre-cook rice 5-7 minutes. When ready, mix with onions, salt, pepper and tomato paste. Then add chopped carrots, peppers and potato. Cook for 45 minutes.
Cut vegetables into thin rings and layer: potatoes, Veganaise, onion, bell pepper, tomatoes, Veganaise, sprinkle (vegan) cheese on top and bake in the oven for 10-15 minutes.