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Heat oven to 160C/140C fan/gas 3. Fit the gammon, quite snugly, in a big, deep roasting tin or casserole. Reserve 150ml of the pineapple juice, then pour the rest over the gammon, plus enough water to fill the tin about three-quarters full. Cover tightly with a few sheets of foil, then put in the oven and bake for 4 hrs. About halfway through, check the liquid levels and turn the gammon.
Remove the gammon and pour off the liquid. Cut away the rind and most of the fat, leaving just a thin layer of fat on the joints.
Whizz the reserved pineapple juice, allspice, treacle, ginger, ketchup, sweet chilli and honey together to combine to a purée. Spoon all over the gammon and set aside until ready to serve (or, if you’ve made at home before taking to the host’s house, cover and chill for up to 48 hrs).
To serve, heat oven to 200C/180C fan/ gas 6. Roast for 30 mins until hot and sticky, then loosely break into large chunks to serve.