Preheat oven to 425°F (220°C).

In a large bowl, whisk together flour, baking powder, and salt.

Cut in cold butter until mixture resembles coarse crumbs.

Gradually stir in buttermilk until just combined.

Turn dough onto a floured surface and pat into a 1-inch thick round. Cut out biscuits and place on parchment-lined baking sheet.

Bake for 12-15 minutes until golden brown.

While biscuits bake, heat broth, soy sauce, and Worcestershire sauce in a saucepan to create au jus.

Slice baked biscuits open, fill with roast beef, and serve with au jus.