How to Make It
Preheat oven to 425°. Mix together first 5 ingredients and 1/3 cup sugar. Add butter, and process in food processor until mixture resembles coarse meal. Add carrot and ginger, and pulse just until blended.
Whisk together egg, buttermilk, and vanilla in a separate bowl until blended. Add to flour mixture, and pulse just until blended and slightly moist. (Dough will be sticky.)
Transfer dough to a well-floured surface with well-floured hands. Divide in half, and pat each half into a 3/4-inch-thick circle. With a floured knife, cut each circle into 6 wedges.
Place wedges on a lightly greased baking sheet. Brush top of each scone with egg wash, and sprinkle each with 1/4 teaspoon sugar.
Bake at 425° for 15 minutes or until golden. Serve warm, or let cool completely, and store up to 2 days in an airtight container at room temperature.