Heat oven to 400°. Whisk flour, salt, sugar, and baking powder in a bowl. Using a box grater, grate 10 tbsp. butter into flour mixture, and gently mix with your hands. Add buttermilk, and gently fold to combine to form a soft dough.
Turn dough onto a floured surface; pat into an 8" x 6" square (about 2" thick). Cut into 4 squares. Stack the squares on top of each other and roll until 3" thick. Cut into 6 squares. Place 3" apart on a parchment paper—lined baking sheet. Melt remaining butter in a small pan; mix with the honey. Bake until puffed and cooked through, about 20 minutes.