01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, whisk together the flour, baking soda, and salt until evenly distributed.
03 - Form a well in the center of the flour mixture. Pour in the buttermilk. Using a wooden spoon or your hand, mix gently until a shaggy dough comes together. Avoid overworking the mixture.
04 - Turn the dough onto a lightly floured surface. Knead briefly just until it holds together. Shape into a round loaf approximately 2 inches thick and transfer to the prepared baking sheet.
05 - Using a sharp knife, cut a deep cross pattern into the top of the loaf, about ½ inch deep.
06 - Bake for 35–40 minutes until the loaf develops a golden-brown crust and produces a hollow sound when tapped on the bottom.
07 - Transfer the loaf to a wire rack and let cool for at least 30 minutes before slicing. Serve warm or at room temperature with Irish butter.