My auntie used to make a sweet white sauce at Christmas to serve with Christmas puddings, I was very young at the time but I'm sure it had nutmeg in it.
I have a vague memory of something similar being sold in tins but I've looked (hoping to recreate it from the ingredients) and I can't see anything.
I've googled but can only find recipes which use water and cornflour, in my head this was more like a sweet béchamel but I could be wrong.
Any thoughts would be appreciated.