Preheat your oven to 425°F.
In a big bowl, mix together 3 cups of flour, 1 big tablespoon of baking powder, 1 teaspoon of salt, and 1 tablespoon of sugar.
Grate 1 stick of really cold butter into the dry mix. Then, use your hands to mix it until it feels like sand.
Slowly pour in the buttermilk, a little at a time, while stirring with a fork or whisk.
Use your hands to gently bring the dough together. Don't overwork it or the butter will melt. It should be a bit loose but easy to shape.
Put the dough on a floured surface. If it seems dry, add 1 or 2 more tablespoons of buttermilk. Shape it into a long oval.
Sprinkle 2 more tablespoons of grated butter on top. Fold both sides of the dough in to make three layers.
Flatten the dough with your hands or a floured rolling pin until it's thick enough to cut with a biscuit cutter.
Cut out the biscuits (you should get 6 or 7) and put them in a buttered cast iron skillet. Don't twist the cutter - this will keep the layers separate.
Cut the remaining 2 tbsp of butter into small pieces and put them on top of the biscuits.
Bake for about 20 minutes, or until the biscuits are golden brown.
Take them out of the oven and brush each biscuit with the honey butter so it melts in. When you serve the biscuits, split them in half and add another smear of honey butter.