It was after the part where joe accuses pip of bolting his food
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The elixir is called tar water and it was pretty vile stuff,
"Some medical beast had revived tar-water in those days as a fine medicine, and Mrs. Joe always kept a supply of it in the cupboard; having a belief in its virtues correspondent to its nastiness. At the best of times, so much of this elixir was administered to me as a choice restorative, that I was conscious of going about, smelling like a new fence."
Tar water was "a Medieval medicine consisting of pine tar and water".