Preheat oven to 425 degrees F and line two baking trays with parchment paper or silicone.
In a large mixing bowl, whisk flour, baking powder, and salt. Set aside.
If you have yuzu zest, mix it by hand in a separate bowl with the granulated sugar. Set aside.
Mix in softened butter into your flour mixture by hand, until your mix has the texture of moist sand. Whisk in the zest and sugar.
In a separate bowl, whisk milk, yuzu juice, and eggs.
Pour about a cup of the milk mixture into your flour mixture, reserving at least 2 tbsp of liquid for later. Different brands of flour will absorb liquids differently, so I recommend pouring a little at a time and adding more as needed. Mix until your dough comes together and no longer has dry patches. It's okay if your dough is a little sticky, as you will turn it out onto a lightly floured surface.
Dust a clean surface with flour and turn out your scone dough. For triangles, pat dough into two 6 inch discs about an inch thick and cut each circle into sixths, resulting in 12 total triangle scones.
Transfer scones to your prepared baking tray. Brush the tops with the remaining milk and egg mixture and bake for 15 minutes or until cooked through and just slightly browning on the edges.