Green’s Dictionary of Slang

prattle-broth n.

tea.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Prattle broth, tea.
1796		Grose Classical Dict. of the Vulgar Tongue (3rd edn) .
1811		Lex. Balatronicum [as cit. 1796].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1848		Flash Dict. in Sinks of London Laid Open.