Cook the rice for about 20 minutes in 400 ml boiling salted water. Peel and finely dice onion. Fry in 1 tablespoon of hot oil until translucent. Add cream, stir in mustard and bring to the boil. Stir in sauce thickener.
Season the sauce with lemon juice, salt and pepper. Cut cress from the stems with scissors and add to the sauce. Roast sunflower seeds in a pan without fat. Remove and mix into the rice.
Separate the outer leaves from the chicory. Wash and halve the chicory. Cut out the stalk in a wedge shape. Heat the remaining oil in a frying pan and fry the chicory halves on both sides for about 2 minutes.
Clean, wash, quarter, seed and cut the tomato into small cubes. Arrange two chicory halves each with some rice and sauce on a plate. Sprinkle with tomato cubes.