Remove the green bracts from the cabbage. Put the cauliflower upside down in 2-3 l cold water with vinegar for about 10 minutes, this will bring out any insects that may be present.
If the cauliflower is cooked whole, shorten the stalk to the base of the first florets and cut crosswise - it has the same cooking time as the florets. Wash the cauliflower.
For cauliflower florets, cut or break off the florets one by one from the stem with a small knife. Pluck off small leaves that are still attached to the lower florets in particular. Wash the florets.
Put the cabbage in a pot and add water until everything is covered. Add about 1 teaspoon of salt. Pour in the milk, so that the cauliflower stays nice and white. Bring to the boil. Cover the florets and cook for 6-8 minutes, the whole head for 18-20 minutes.
Crumble toast with your hands. Roast in a pan without fat until golden brown. Add butter and melt in it. Spread the crumbly butter over the cauliflower.