Postem (sp?) the drink - What is it?

I was watching Seinfeld tonight (the one with the Pez) and George made of list of things to talk to his girlfriend about on the phone and one of things to talk about was how postem (sp?) was an underrated drink. What is postem (sp?)? Is it a brand-name or a type of drink?

Postum.

All I think I know is it is a caffeine-free coffee substitute.

Postum® is a grain-based caffeine-free hot beverage created in 1894 by C. W. Post, founder of Post cereals.

Basically it is a hot cup of burnt toast. But on the smoother end of the spectrum rather than the pungent.

LINK

Postum

The ingredients have changed since Post invented drink in 1894:

Postum is to Mr. Coffee Nerves as Kryptonite is to Superman.

Based on the flavor, I always assumed it was fine-ground burnt croutons. I may be wrong, though.