In a bowl, combine the flour, baking powder, and salt. Using your hands, mix in 1 stick of shredded butter. Pour over the milk and add the honey. Mix until just combined.
Turn the dough out onto a floured surface. Pat into a 1-inch-thick rectangle. Fold one side into the center, then the other side on top. Like a letter. Turn the dough horizontally. Flatten into a rectangle again. Repeat the folding. Turn the dough horizontally one more time. Flatten into a ¾-inch-thick rectangle. Wrap the dough and freeze it for 15 minutes to allow it to rest.
Preheat the oven to 425° F.
Mix the hot water and baking soda. Brush it onto the entire top surface of the dough.
Cut dough into biscuits using a floured biscuit cutter (around 2 ¼ inches) or cut into 10 squares. Do not twist the cutter when cutting. Re-roll the remaining dough and cut more circles. Arrange the biscuits on a parchment-lined baking sheet. Brush the tops with beaten egg yolk and sprinkle with salt.
Freeze the biscuits for another 15 or 20 minutes. Then bake until golden brown, 20-22 minutes.
Meanwhile, whip the butter and honey together until creamy. This is easiest to do with an electric mixer. Serve the biscuits warm with honey butter.
