Place all the ingredients in a very large pan or in 2 slightly smaller pots. Cook over medium heat, stirring occasionally, until the mixture thickens and starts to become sticky, about 2 hours. As the mixture cooks, the liquid will rise to the surface, with the chutney thickening at the bottom of the pan, so continue to stir every so often. (One word of warning: Be careful when stirring the hot chutney—it may be just trembling on the surface, but it can erupt like a volcano when you dig deeper. I find turning off the heat briefly helps . . . as does wearing an apron and standing at a distance!) The chutney is done when the liquid has reduced to the point that it feels and looks less like a sauce and more like, well, a chutney.