01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Whisk together flour, baking soda, and salt in a large mixing bowl.
03 - Create a well in the center and pour in buttermilk. Mix gently with wooden spoon or hand until shaggy dough forms. Avoid overworking.
04 - Turn dough onto lightly floured surface. Knead briefly until just combined, then shape into round loaf 2 inches thick.
05 - Place loaf on prepared baking sheet. Cut deep cross in top about ½ inch deep. Bake 35-40 minutes until golden and hollow when tapped.
06 - Cool on wire rack for at least 30 minutes before slicing. Serve warm or room temperature with Irish butter.