01 -
Preheat oven to 375°F (190°C). Generously grease a 10-inch cast-iron skillet with 1/2 tablespoon butter.
02 -
In a large mixing bowl, whisk together flour, sugar, salt, and baking soda. Cut cold butter into small pieces and use your fingers to work it into the flour until crumbs form. Stir in the raisins, breaking up any clumps.
03 -
Make a well in the center of the dry ingredients. In a separate measuring cup, whisk together the buttermilk and egg, then pour this mixture into the well. Use a wooden spoon and mix just until lightly moistened and dough barely starts to come together.
04 -
Transfer to a floured surface and use floured hands to gently shape the dough into a round loaf. The texture should remain shaggy. If too sticky to handle, dust lightly with flour. Do not over-mix or bread will become tough.
05 -
Transfer dough to the buttered skillet and use a knife to score the top with a large, deep "X". Bake in the center of your preheated oven for 50-55 minutes. When tapped, the bread should sound hollow inside.
06 -
Transfer bread to a wire rack to cool completely. Best enjoyed within 2 days of baking. Refrigerate leftovers for up to a week.