Whisk the flour, sugar, baking powder, zest, nutmeg and salt in a medium bowl. Rub in the butter with your fingertips until the mixture looks sandy. Stir in the currants. Beat the eggs and 2 tablespoons of the buttermilk together. Stir into the dry ingredients to make a shaggy dough, add more buttermilk if the dough is dry. Gather dough into a disk, wrap in plastic wrap and refrigerate for 1 hour.
Roll the dough on a floured workspace into a piece about 1/4-inch thick. Cut into 2 to 3- inch rounds.
Heat a griddle or frying pan over medium-low heat. Brush the pan surface with butter. Cook the cookies until slightly brown and cooked through, about 4 to 5 minutes on each side. Transfer to a rack, sprinkle with sugar and cool. Store in a cookie tin.
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