Definition of "bouilli"

Proofs of the presence of the white man are found all over the Territory in the shape of old bouilli tins, &c., and often when out after a strayed horse, I have imagined myself to be in wilds untrodden except by the foot of the blackfellow, but the sight of an unassuming empty sardine tin would remind me that the ubiquitous digger had been there first.

1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 342