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Like Mr. Woodhouse says in Emma, you want the gruel to be "thin, but not too thin." However, it does thicken more than you might expect.

Gruel is a thin porridge, in essence. It's good savory style or sweet. It was actually a very common food all across the world until victorian workhouses built their much abused version of it. Everyone thinks of Dickens and Oliver Twist.

The primary food of most of the world, historically, has been gruel of some sort.