Make a well in the centre of the bowl, pour in some of the buttermilk and, with a wooden spoon, gradually mix the flour into the buttermilk. Alternatively, make a volcano shape on a marble slab with the dry ingredients, add the buttermilk, and mix with a knife.
Add more buttermilk and mix in more flour. Continue until the flour is completely absorbed into the mix. The mix should not be over-saturated, but have a slightly stretchy look. Handle it as little as possible. You can also ball it up into one or two balls, place them on a flat baking tray, and cut a cross in the top.
Turn the mix into the baking tin and place in a medium hot oven (180°C or 350°F) for 35–45 minutes, or until golden brown.