Preheat oven to 400.

Combine flour, brown sugar, baking powder, ginger, baking soda, cinnamon, and salt.

Using a pastry blender, cut in butter until mixture resembles coarse crumbs. Set aside.

In a small bowl, combine egg yolk, molasses, and buttermilk. Add egg yolk mixture all at once to flour mixture, using a fork, stir just until moistened. Turn the dough onto a lightly floured surface, knead the dough 10 to 12 times or until smooth. Pat dough into a 9 inch circle, cut into 8 triangles, place triangles, 1 inch apart on a baking sheet lined with parchment paper.

Bake for 12 to 15 minutes.

Remove from baking sheet, cool slightly on a wire rack.

Make Maple Glaze:

Combine the glaze ingredients and stir together until reach desired consistency.

Drizzle over scones.