Cook the eggs in boiling water for 5 min, then remove them. shell the eggs very carefully. Shell the king prawns, keeping the heads and tails for the sauce.
Brown the prawn heads and tails in olive oil in a pan. add the diced carrots, onions and celery, and sweat them for a while. add the chopped garlic and continue cooking gently. add the tomato concentrate. Flambée in the cognac. Deglaze with the white wine. reduce by half. Add the water, bouquet garni and seasoning. Bring to the boil and cook for 20 min over a mode- rate flame. sieve through a close meshed conical sieve. Reduce the bouillon to three quarters. add the cream. Bring to the boil. check the seasoning.
Cook the sliced leeks in butter, then season them.
Add the cream to the chicken stock. Bring to the boil. Add the herbs. Liquidize the herbs and stock.
Put a layer of the leeks on each plate. Put a warm egg in the middle of each plate. spoon the prawn sauce over the egg. arrange the hot prawns around the edge. Drizzle with the herb and stock emulsion. scatter with slithers of mullet roe. Break the egg gently to allow the egg yolk to run a little. sprinkle over the herbs.