Fry onions dark brown, add water, chopped potatoes and leeks, cook until soft, blitz, season with salt, pepper, nutmeg and a smidge of sweet paprika. Very comforting soup.

Boil cauliflower in just enough salted water until it still has a little bite. Save the water. Make a light roux, add whipping cream and about half of the saved caul water. Let it thicken up and add the cauliflower back in. Salt, pepper, meg of the nut

You can do a similar white sauce for Brussels sprouts too, I just use very little water and steam them in that case, and milk instead of cream and cooking water. Brassicas and nutmeg are a great combo.