This section is from the book "Tested Recipes for the Modern Hostess", by Daisy Wilson Barnet. Also available from Amazon: Tested Recipes for the Modern Hostess.
Sift together 2 cupfuls Swansdown flour, 1/2 teaspoonful of salt, and 2 of baking powder, rub in 1/2 cupful of mashed potatoes, add 1 beaten egg and enough milk to make a soft dough. Divide into three portions, pat into rounds 1/2 inch thick, and cut each round into quarters. Glaze with 1/4 cup (4 tablespoons) milk and 1 tablespoonful of sugar. Bake in hot oven, split, butter and serve hot.
1 cup flour. 1/2 teaspoon soda. 1/2 teaspoon salt. 4 tablespoons of butter. 2 tablespoons of sugar. 1/3 cup Sultana raisins. 1 teaspoon cream of tartar. 1 egg. 2 tablespoons of buttermilk.
Mix and sift all dry ingredients. Chop the hard butter in until quite fine. Add raisins, then egg (slightly beaten), buttermilk to make a soft dough, and roll out. Dredge board, lightly, toss and pat half the dough into a ball, flatten into the shape of a pie plate, glaze top by brushing with a slightly beaten egg, or 4 tablespoons of milk and 1 of sugar. Bake quickly 15 minutes.
 
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