cotterell’s salad, n. — Green’s Dictionary of Slang

cotterell’s salad n.

[a pun on proper name Sir James Cotterell, an Anglo-Irish nobleman, hanged for rape, itself both a crime and a plant, Brassica napus]

hemp.

1785, 1788, 1796

Grose Classical Dict. of the Vulgar Tongue n.p.: Sir James Cotterel’s sallet hemp. (Irish) Sir James Cotterel was hanged for a rape.