Picanha is a lean cut of meat from the top sirloin area on the cow. It has a large fat cap over the top, which makes it great for adding flavor to the meat.
Leave the fat cap intact for this cook, but you can score it in a cross hatch pattern to allow the salt to penetrate over the top of the meat and for the fat to get crispier.
Cook to your level of preferred doneness. I usually pull mine around 125 F. It will have some carry over cooking and hit closer to 130 F. before serving.