Remove the leaves from the cauliflower and cut out the stalk in a wedge shape. Wash and cook in a little salted water for 10-15 minutes.
Boil the eggs hard, quench, peel, dice. Dice the ham.
Make a roux from butter, flour and milk, season it with salt, pepper and nutmeg. Refine with a pinch of sugar. Chop the herbs, add to the sauce with the sour cream and season with lemon juice.
Place the drained cauliflower on a plate. Pour the sauce over it and sprinkle with diced egg and ham.