Clean and wash the cauliflower and divide it into small florets. Cook in boiling salted water for about 5 minutes. Remove, rinse in cold water and drain. Measure out 1/4 litre cauliflower stock and put aside.
Melt the fat in a pot, stir in the flour and let it sweat on over a low heat for about 5 minutes without letting any colour take over. Deglaze with cauliflower stock and milk and let simmer for about 15 minutes at low heat, stirring occasionally.
In the meantime soak the toast in cold water. Peel onions, dice 1 and cut 1 into rings. Knead the minced meat with the well squeezed toast, egg and diced onion to a smooth mixture. Season with salt and pepper.
Form 4 meatballs with moistened hands. Heat the oil in a pan. Fry the meatballs and onion rings over medium heat while turning for 8-10 minutes. In the meantime, season the béchamel with salt and nutmeg and bring to the boil.
Add the cauliflower and warm it up for about 5 minutes. In the meantime, wash the herbs and dab dry. Pluck parsley leaves from the stalks and chop finely, except for something to garnish. Cut the chives into fine rolls.
Add herbs to the cauliflower. Arrange the cauliflower with béchamel sauce and meatballs on a plate. Garnish the cauliflower with the remaining parsley and the meatballs with the onion rings.