Sift dry ingredients together. Line a baking tray with parchment paper. Into a large mixing bowl, sift in your dry ingredients: flour, baking powder cinnamon, ginger, cloves and salt. Add in the sugar and stir together.
Whisk wet ingredients together. Remove one teaspoon of the whisked egg and set aside - this will be used for egg wash later on. Into the remaining egg, add the pumpkin puree, buttermilk, vanilla and mix together.
Add butter to flour. Add the chopped butter to the flour mix and using your fingertips, toss the pieces until they are separated and coated with flour. Rub the flour and butter together until it looks like breadcrumbs with some larger pieces the size of peas. (Alternatively, use a pastry cutter).
Combine wet with the dry ingredients. Make a well in the dry mix and pour in the pumpkin mixture into the centre. Use a fork to stir until the mixture starts to come together to form a dough. It will still be very shaggy at this point and feel quite sticky. If necessary, use your hands to lightly bring it all together incorporating the dry flour left at the bottom of the bowl. If you need to add a little more moister, then add buttermilk one tablespoon at a time.
Bring the dough together and roll it out. Tip the pumpkin scone mix onto a lightly floured surface and, using your hands, bring it together. Gently flatten it out. We will use a folding technique to create flaky layers and incorporate air into the dough. I use a bench scraper to help me out. Fold the dough in half and turn, then fold in half again. Divide the dough in two. Using your hands, shape each portion of dough into a round disc or gently roll with a rolling pin until the dough is roughly 4 cm (11⁄2 inches) thick. Place dough on the prepared tray. Place discs onto the prepared baking tray. With a sharp knife (or using the bench scraper), cut each disc into 6 equal-sized wedges. Now refrigerate the tray for 30 minutes to rest the dough. Pre-heat oven to 200°C (425°F) whilst the scones are in the fridge.
Egg wash and bake. Using the egg wash that you set aside earlier, brush the tops of the scones. Take care not to let any drip down the sides of the scones, as this can inhibit their rise. Sprinkle with coarse sugar. Bake for 15-18 minutes until golden brown and well risen.