Cook the rice in boiling salted water for about 25 minutes. Peel kohlrabi and cut into cubes. Wash and clean the mangetouts. Cook both in boiling salted water for 5 minutes, drain. Wash, clean and halve the tomatoes.
Peel and finely chop the onion. Season yoghurt with salt and pepper. Cut cress from the bed. Wash chives, dab dry and cut into rings. Crumble feta cheese. Drain rice and let it drain.
Heat the oil in a pan and fry the kohlrabi. Steam onion, sugar snap peas and tomatoes briefly, deglaze with broth. Add rice and heat for 2-3 minutes. Season to taste with salt and pepper. Sprinkle feta cheese, chives and cress over the rice pan.
Garnish with chervil. Serve with yoghurt.