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Butter a loaf pan and line with two small sheets of parchment, allowing the paper to overhang on all sides. Set aside.
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Preheat the oven to 350 degrees.
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After the dough has doubled, turn it out on to a lightly floured surface and roll it into a large rectangle. Spread the filling over the surface and roll it up tightly by the short side.
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Stretch and roll it out it into a longer log, about and cut the log in half. Lay one piece on top of the other in a n X and twist both ends together.
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Place in the prepared loaf pan and cover loosely with plastic wrap or a clean dish towel. Allow to rise about an hour.
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Brush with egg wash and sprinkle with sugar.
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Bake until deeply golden brown and set, about 45 mins. Allow to cool in pan for about 10 mins, then remove to a wire rack. Cool to room temperature, slice and serve.