Sift flour, sugar, baking soda, and cream of tartar into a bowl.
Cut butter into 1cm cubes. Rub it into the flour mixture with your fingertips until it resembles breadcrumbs. (Or use a mixer with a flat beater.)
Gradually add buttermilk, mixing until a soft, spongy dough forms. You may not need the full amount.
Turn the dough onto a floured surface and gently knead. Roll out to 1 inch thick.
Cut into circles and place on a baking tray.
Bake for 15–20 minutes until golden and risen.
Video
Notes
To make buttermilk, take one cup of milk and stir in 1 tbsp of white vinegar. Let sit for 5 minutes before using.
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