Brian makes these biscuits every year for the Flametree Ball.
3 c flour
¾ c sugar
2 ½ c currants
200 g butter
2 ½ tbsp cream
1 egg yolk
¼ t nutmeg
2 t sack (or sherry)
Mix the flour, sugar and currants. Add the butter, cream, egg yolk, nutmeg and sack. Mix well, then put the dough in a dish, place it before a fire, and warm it through. Divide the dough into flat cakes about a hands’ breadth across, and prick each cake full of holes. Bake at 180C for about twenty minutes.
Source: The Closet of the Eminently Learned Sir Kenelme Digby Kt. Opened (1669), redaction from Cariadoc’s Miscellany.