He will have a hearty choak and caper sauce for breakfast; i.e. he will be hanged.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Heart’s Ease * Heathen PhilosopherNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes