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When you're ready to make the dish, start with the venison sauce. Preheat an oven to 180ºC/gas mark 4 and place the venison bones in a baking dish with a knob of the butter. Roast for 15 minutes, adding another knob of butter every few minutes, until the bones are nicely roasted and golden brown. Remove one-third of the bones from the pan at this point and reserve in the fridge for later