“Soda bread is to Ireland is what pasta is to Italy. It is as Irish as the flag itself! Every Irish kitchen has been filled with the aroma of freshly baked Irish soda bread, which is light and crumbly in texture, with a soft richness that comes from the buttermilk. You can make it with regular milk if you are unable to get your hands on buttermilk. The fresh thyme adds a light floral aroma, but it’s a delicate flavor. You can also substitute the thyme for rosemary, 1 teaspoon ground fennel seeds, or 1/3 cup raisins.” — Clodagh McKenna, Clodagh’s Irish Kitchen — A Fresh Take on Traditional Flavors
Preheat the oven to 425 degrees F. Flour a baking sheet and set aside.
Sift the flours, followed by the baking soda, into a large mixing bowl and add a pinch of salt and the thyme. Mix together with clean hands.
Make a well in the center of the flour mixture and slowly pour the 2 1/2 cups buttermilk into the well. Use your free hand to mix the flour into the buttermilk — try to spread your fingers far apart so that your hand resembles a trough. Make sure there are no dry patches and that the dough is completely wet.
Flour your hands and shape the dough into a round. Place on the floured baking sheet. Flour a large knife and cut the shape of a cross into the top of the dough, two-thirds of the way through, and then stab every quarter with the knife. This old Irish tradition was apparently intended to kill the fairies! Using a pastry brush, brush the round of bread with the remaining buttermilk — this will give the bread a lovely color once baked.
Bake in the oven for about 25 minutes, then turn the bread over and bake for another 5 minutes. To test whether the loaf is cooked, tap the bottom with your knuckles—it should sound hollow.
Cool on a wire rack before serving. The soda bread will keep for 3 to 4 days in an airtight container.