British Apple Scones

Name: British Apple Scones
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: European, British
Ingredients: 200 g (1 cup) plain (all-purpose) flour; 1/4 tsp salt; 2 tsp baking powder; 50 g (1/4 cup) butter (1/2 stick); 50 g (1/4 cup) sugar; 1 medium sized Granny Smith (cooking) apple, peeled, cored, and coarsely grated; about 4 Tbsp buttermilk (only use enough to make a soft dough, but not sticky); more buttermilk or milk for brushing the dough; Demerara sugar to sprinkle (use white sugar if that's all you have)