Preheat your oven to 425°F (220°C).
In a large mixing bowl, combine the flour, baking soda, and salt.
Stir in sugar, raisins, or caraway seeds if using.
Create a well in the center of the dry ingredients.
Pour in the buttermilk gradually.
Mix until a soft dough forms, being careful not to over-knead.
Turn the dough onto a floured surface and shape it into a round loaf.
Score a cross on top of the loaf with a sharp knife.
Place the loaf on a baking sheet lined with parchment paper.
Bake for 30 minutes or until golden brown and sounds hollow when tapped.