...a mushroom is not a vegetable...
This reminds me of a comic panel from the Feb 1983 Playboy. In the scene you see the inside of an ice cream parlor and a sign syating the flavors they sell are Corn, Wood, Liver and Vanilla. The clerk behind the counter says, “We’re out of vanilla”.
I wish I could ost a picture... but I can’t find a digital copy.
That's what rhubarb pie is for!