Preheat oven to 200°C. Line a baking tray with baking paper.
Chop the chorizo into tiny cubes and grate the cheese.
Sift the flour into a large bowl, then rub in the butter until it looks like fine breadcrumbs. Add the cheese and chorizo, gently combine. Stir in the kefir or buttermilk, then mix with a blunt knife until you get a soft dough.
Tip the dough onto lightly floured surface and gently knead until smooth. Flatten it to to 2-3cm thick and cut out rounds with a small cookie cutter. Repeat until the dough is used up.
Place the scones on the baking tray, brush the tops with milk and scatter some grated cheese over them if you like.
Bake in the oven for 10-15 minutes until risen and golden.
Cool them on a wire rack before serving.