Cream of mushroom/tomato soup

[Gigakid]

Why is it called cream 'of' tomato soup and cream 'of' mushroom soup? Neither of these foods contain cream the cream is added to the soup later.
Surely tomato/mushroom soup 'with' cream would be more logical?
Anyone shed any light?

[4getmenot]

it doesnt have to contain cream, its the cream of tomato or the cream of mushroom. When something is of creamy texture its not always cream.

[4getmenot]

i.e. anti wrinkle cream.

[Old_Geezer]

Just tradition I suspect. It sounded appetising. That's marketing hype for you.

[heathfield]

Cream (v). (transitive): to combine two or more things to form a thick smooth mixture. (Macmillan Dictionary)

[Ratty2E]

It's made with cream to give it that creamy texture but why it's called cream 'of' rather than 'creamy' or 'with cream' i have no idea.