Put rice in just under 1⁄2 l boiling salted water, cover and let it swell at low heat for about 20 minutes.
Boil the eggs for about 8 minutes. Clean and wash the broccoli and cut into florets. Cover and cook in approx. 3⁄4 l boiling salted water for approx. 5 minutes. Drain, collect the vegetable water.
Peel and finely chop the onion. Heat oil in a coated pan. Fry the onion until transparent. Deglaze with approx. 1⁄2 l vegetable water, bring to the boil and stir in the stock. Mix starch and crème légère until smooth, stir in, bring to the boil and stir in at least
Simmer for a minute. Stir in mustard. Season sauce with salt and pepper.
Quench the eggs, peel them and cut them into 6 slices each. Heat broccoli, eggs and prawns briefly in the sauce. Garnish ragout with parsley. Add rice.