Preheat the oven to 375°F. Lightly grease a 9 x 5" loaf pan.
In a large bowl, whisk together the flour, baking powder, baking soda, salt, sugar, raisins or currants, and caraway seeds.
In a separate bowl, whisk together the egg and buttermilk.
Quickly and gently stir the wet ingredients into the dry ingredients.
Stir in the melted butter.
Spoon the batter into the prepared pan. Draw your finger around the edge of the pan to create a moat. Drizzle the bread with 1 tablespoon of milk - the moat will prevent the milk from running down the sides of the loaf pan. Sprinkle with sugar.
Bake the bread for 50 minutes - 1 hour, or until a toothpick inserted into the center comes out clean.
Remove the bread from the oven, loosen its edges, and after 5 minutes, turn it out onto a rack to cool.