LH offers the premium plaza lounge in DEL for its F pax, but only on request at checkin will you get a voucher. You will get a PA at checkin who will guide you thru immigration and security and to the lounge of your choice (you can go to the AI, SQ or LH lounge or premium plaza with a voucher). When its time to board, the PA will pick you up and take you all the way to the aircraft door.
More about the pleasures of Lufthansa First are listed here:
http://www.flyertalk.com/forum/lufth...ce-thread.html