Wash, clean and quarter the tomatoes. Peel and finely chop the onion. Wash the chervil and put some leaves aside for garnishing. Heat the oil in a pot. Fry the onions in it until golden brown.
Add tomatoes and chervil. Fill with stock. Simmer at medium heat for about 20 minutes. In the meantime, put rice in plenty of boiling salted water, cover and let it swell at low heat for about 20 minutes.
Clean, wash and dice the peppers. Blanch in boiling salted water for about 3 minutes. Pour broth through a sieve lined with a kitchen towel. Season with salt, pepper and paprika powder.
Heat again. Add the diced peppers and rice. Serve garnished with chervil leaves.