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1. Preheat oven to 375ºF (190ºC). Butter a baking sheet or cake pan.
2. In a large bowl, mix together the flour, salt, baking powder, and soda, then stir in the raisins, if desired. Add enough buttermilk to make a soft, kneadable dough.
3. Turn out the dough onto a floured surface and knead it briefly. Shape it into a round loaf and place it on the baking sheet. Cut a cross in the top of the loaf with a single-edged razor blade or a very sharp floured knife.
4. Bake for 35 to 40 minutes. Remove from oven and cool on a rack.
Yield: 1 loaf