It's not actually cream.

[esyla]

You know that thing you do, when you go to the store to buy ingredients for something, and you think you have something, so you don't buy it, but then you get home and start and realize you don't have that thing after all?

Face, meet palm.

I asked my neighbor if she had any cream of tartar, just in case, and she said, "Oh, no. I don't eat fish."

Informal poll: Do you know what cream of tartar is?