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 thoroughly incorporated.
03 - Create a well in the center of the flour mixture. Pour in the buttermilk. Mix gently with a wooden spoon or your hand just until a shaggy dough forms. Avoid overworking the dough.
04 - Turn dough onto a lightly floured surface. Knead briefly only until it comes together. Shape into a round loaf approximately 2 inches thick. 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. Bake for 35-40 minutes until golden brown and the bottom sounds hollow when tapped.
06 - Transfer loaf to a wire rack and cool for at least 30 minutes before slicing. Serve warm or at room temperature with Irish butter.