I don't know if it is a JM soup but one of my favorites is cauliflower make it with a mixture of two parts milk one part water then stir in cream or creme fraiche when serving
JM is one of my favorite chefs and I love his programmes and I am sure for you who do LCHF he is a hero as he uses loads of butter and cream I usually substitute reduced fat creme fraiche for the cream in soup
I bought some 200ml and some 300ml throwaway plastic pots from Ebay. I use these for other foods I freeze. I pretend that I need to know how much of whatever I have and that the sizes gives me consistency but I can always eat two when I come to my senses.