Preheat oven to 400ºF (200ºC).
Line a baking sheet with parchment paper or grease the bottom.
Food processor: place 2 ¾ cups cake or all-purpose flour, 1 tablespoon baking powder, ⅛ teaspoon salt, 6 tablespoons white or light brown sugar and 1 teaspoon orange zest in the bowl of a food processor fitted with the steel blade. Pulse a few times to mix.
Scatter 6 ounces unsalted butter, diced and cold, on top, and process on low until the mixture is grainy and the butter the size of peas. Don't overprocess.
By hand: add the dry ingredients (2 ¾ cups cake or all-purpose flour, 1 tablespoon baking powder, ⅛ teaspoon salt, 6 tablespoons white or light brown sugar and 1 teaspoon orange zest) to a large bowl and combine them well with a spoon or rubber spatula.
Scatter the butter pieces on top and integrate by hand or with a pastry cutter. The pieces of butter should be the size of peas and beans. It will be irregular. For both methods, transfer the mixture to a large mixing bowl and 1 ½ cups fresh strawberries, diced and stir lightly with a spoon or rubber spatula.
Drizzle ¾ cup buttermilk and 1 teaspoon vanilla extract over the flour mixture.
Mix with a spatula or fork until it barely comes together, but don't mix too much or the scones will be tough and flat.
On a lightly floured surface, transfer the mixture, and pat it together, folding it unto itself a few times (I use a dough scraper to help me fold the dough onto itself), until you have a circle of dough that holds together. It will still be shaggy in places. Don't be tempted to overwork it as you would a pie crust. I don't use a rolling pin, but if you want to roll it very lightly, you don't want to press it down and compact it too much, simply pat it so it holds together. Make a circle with the dough, about 2 inches high.
Cut the circle in half using the dough scraper or a large kitchen knife. Then cut each half in half again and each part in half again until you have 4 triangles. You should have 8 pieces or triangles in total. At this point, they can be frozen, well covered, for up to a month, and baked directly from the freezer. They might take a few more minutes.
Transfer to the prepared baking sheet, and sprinkle the tops with additional sugar.
Bake for 15 minutes, turn down the oven temperature to 350°F/180°C, and bake for an additional 20-25 minutes, until golden, dry, and quite firm. If you need to check, with the tip of a fork lift the top of a scone and see if the inside is dry. Depending on the size and height, the bake time might vary, so start checking at the 30-minute mark.
I recommend eating them within a few hours of being baked. Store leftovers in an airtight container for a day, maybe two, but the texture is much better the day they're baked.