Grease a griddle or large frying pan with oil or white vegetable fat.
Measure the flour, bicarbonate of soda and cream of tartar in a bowl, add the lard and rub in until it resembles breadcrumbs. Stir in the currants.
Mix to a soft dough with the milk and turn out onto a lightly floured surface. Knead lightly, then roll out to a large round and about ¼ inch (5mm) thick. Alternatively, cut the dough ball into two if your pan isn't big enough.
Lift the scone round onto the griddle or pan and cook on a gentle heat for about 5 minutes on one side, then carefully turn over and cook on the other side for a further 5 minutes until nice and brown.
Slide onto a wire rack to cool slightly, then split and butter, sandwich back together and serve hot.
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