Put the rice in plenty of boiling salted water, cover and let it swell at low heat for about 20 minutes. Then drain. In the meantime defrost the peas.
Peel the onion and cut into slices. Shrimps, up to the tail ends, from the bowl loosen and remove the black intestine. Wash the prawns and pat them dry. Clean the chilli pepper, cut lengthwise, remove seeds, wash and chop.
Wash, clean, quarter and seed the tomatoes. Cut the flesh into small cubes. Heat oil. Fry onion slices and prawns for 5 minutes, turning them over. Season with salt, chilli and lemon juice.
Add rice, season with saffron. Stir in peas and tomatoes and heat up. Season again and serve in small pans garnished with lemon, dill and chili.