In a bowl, combine the flour, sugar, salt, and baking soda.
Grate the frozen butter using the grater box’s side with large holes.
Cut the grated butter into the dry ingredients using a pastry knife, fork, or by hand until the mixture resembles a coarse meal with pea-size pieces of butter in it.
In a small bowl, whisk together the egg, vanilla extract, and milk. Optionally, reserve 1 tablespoon of the mixture to use as an egg wash later.
Add the wet ingredients to the butter and flour mixture and bring the dough together. Do not knead it. Just press and squeeze it with your hands until it comes together. If the dough stays too dry and crumbly, incorporate 1-2 tablespoon of milk into the dough. If the dough is too sticky, add a little bit more flour.
Transfer the dough onto a floured surface and form a 2” (5cm) thick disk. Cut it into 8 triangles and place them on a baking sheet lined with parchment paper.
Place the baking sheet in the fridge and preheat the oven to 400F (200C).
When the oven is hot, brush the scones with the reserved egg wash and bake them for 15-18 minutes or until golden on top and around the edges.
Allow them to cool down to room temperature before decorating.
Melt the chocolate in the microwave in short increments, mixing in between until ⅔ of it has melted. Allow the rest of the chocolate to melt from the residual heat while agitating it with a spoon.
Drizzle the chocolate above the fully cooled scones using a spoon or a piping bag. Allow the chocolate to set and serve.