In a large bowl, combine flour, sugar, baking powder, ground ginger, and salt, whisking well. Using a pastry blender, cut butter into flour mixture until it resembles coarse crumbs. Add crystalized ginger, stirring to blend.
In a small bowl, combine almond milk and egg yolk, whisking well. Add to flour mixture, stirring until mixture is evenly moist. (If dough seems dry, add more almond milk, 1 tablespoon at a time.) Working gently, bring mixture together with hands until a dough forms.
Turn out dough onto a lightly floured surface. Knead gently 4 to 5 times. Using a rolling pin, roll dough to a ¾-inch thickness. Using a 2-inch fluted square cutter, cut 12 scones from dough, rerolling scraps as necessary. Place scones 2 inches apart on prepared baking sheet.
Garnish tops of scones with sliced almonds and crystalized ginger, if desired.
Bake until edges of scones are golden brown and a wooden pick inserted in the centers comes out clean, approximately 20 minutes.
Serve warm.
Recipe by TeaTime Magazine at https://teatimemagazine.com/double-ginger-scones-recipe/