In a food processor, blend the arugula with the butter, then add the flour, baking powder, and salt. When the dough forms a ball, place it on a floured surface and knead it briefly (add a sprinkle of flour if necessary). Wrap it in plastic wrap and let it rest in the fridge for 20 minutes.

Take the dough from the fridge, roll it out to about 1/8 inch thick, and cut it into strips 1/2 inch wide and about 8 inches long. Wrap each strip around greased metal cones (if you don't have cones, roll a piece of aluminum foil).