NBCUniversal next month is launching the Dun Dun Diner , a “Law & Order”-themed pop-up restaurant, to celebrate the 35th anniversary of the criminal justice franchise.

The eatery, named after the show’s famous sound effect , will be open at Rockefeller Center for one weekend only: from Oct. 3-5.

Fans can attend for free, though visitors will need to make reservations — granted on a first-come, first-serve basis. Reservations are available beginning at noon ET on Friday on exploretock.com/dundundiner .

“The Dun Dun Diner will immerse fans in the universe of the iconic franchise in an experience inspired by the quintessential NYC hangout for hard-working detectives,” the reservation site reads.

“The multi-day event will give fans the chance to indulge in diner favorite dishes, snag

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