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Always check with your butcher whether your gammon needs soaking overnight first - ours did, so we popped it in some cold water and left it overnight in the fridge.
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The next day, after draining, I returned it to the pan and prepared it for a nice hot bath.
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Add the gin, tonic, sliced citrus and top it off with cold water.
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Put it on a medium heat, and bring it to the boil.
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Let it simmer gently for 1.5 hours (20 minutes per 450g, plus 20 minutes).
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When done, remove it from the heat, and remove the meat from the pan and place it in a suitable roasting tin or dish.
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Wait a few minutes, until the meat is comfortable to handle, and in the meantime mix the marmalade and a little of the cooking liquid together - just enough to loosen the marmalade.
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Pre-heat the oven to Gas Mark 5/190°C.
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Once cooled a little, use a sharp knife to remove the skin from the ham, leaving a layer of fat, thick enough to score in a diamond pattern.
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Brush the gammon with half the glaze and put into the oven for around 15 minutes.
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Repeat the process and leave it for another 15 minutes, or until the glaze is shiny and golden.
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Remove from the oven and leave to 15 minutes before serving.