Preheat oven to 400℉(204℃). ** Baking options for the baking pan are in the tips above. We used a seasoned cast iron skillet.
Whisk the egg and buttermilk together then set aside.
Whisk together 4-¼ cups (531-¼ grams) flour (the remaining ¼ cup flour will be for your hands and counter), granulated sugar, baking soda, and salt together in a large bowl
Using the pastry cutter, cut in the butter pieces into the flour mixture. You may also use a fork or your fingers.
The mixture is very floury so do it may take a bit to get the butter mixed into the flour so that it turns into peas-sized crumbs.
Stir in the raisins.
Pour in the egg/buttermilk mixture. Gently fold the dough together until the dough is too stiff to stir.
Transfer the dough onto a lightly floured surface. Flour your hands and work the dough into a ball.
Knead the dough for about 30 seconds, until the flour is moistened. If you find the dough is too stick, add a bit more flour. It should pick up some of the flour from your work surface.
Transfer the dough to the cast iron skillet or whatever prepared pan you plan to use.
With a sharp knife or lame, slash an X onto the top of the soda bread.
Bake until the bread is a golden brown and the cut center appears cooked through, about 45 minutes. If you find the the bread is browning too quickly, loosely cover the bread with aluminum foil.
Remove the bread from the oven and allow the bread to cool for 10 minutes in the skillet.
Remove the bread from the skillet and transfer it to a wire rack to finish cooling.
Serve warm or at room temperature.