Remove the cauliflower from the leaves and cut off the end of the stalk. Put the cabbage in cold salted water for about 15 minutes so that any bugs that are still stuck swim out.
Bring plenty of water with salt and lemon juice to the boil, add the cauliflower with the stalk facing down and cook over low heat for about 20 minutes. Take out and place on a preheated plate.
Measure ¼ l of the cauliflower water and bring to the boil with milk and cream. Mix some milk with some flour and use it to thicken the sauce. Let it boil briefly, season and add herbs. Pour the herb sauce over the cauliflower.