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Preheat the oven to 200c.
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Place the flour, baking powder and sea salt in a large bowl and mix together well. Make a well in the centre of the flour and gradually add the milk and buttermilk, stirring with a wooden spoon until a soft dough forms.
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Turn dough out onto a lightly floured surface and knead until smooth.
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Roll out the dough to a 30cm square.
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Put the tomatoe puree, barbeque sauce and oregano leaves in a bowl and mix to combine, then spread the tomato mixture over the dough and then top with cheese and the ham.
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Roll the dough to enclose the mixture.
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Slice the roll into 15 pieces and place the scrolls side by side onto a baking tray lined with baking paper.
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Brush the tops of scrolls with the beaten egg and bake for 20 minutes or until scrolls are golden in colour.