In "Parks and Recreation," the local diner where the characters love to eat waffles is JJ's Diner.
JJ's Diner is one of Pawnee's most recognizable recurring locations and serves as Leslie Knope's favorite restaurant. Leslie is especially associated with ordering waffles there, often with an extravagant amount of whipped cream. Her intense devotion to waffles becomes one of the show's most persistent food-related jokes.
The diner also functions as an informal meeting place for Pawnee's government employees. Scenes there let characters discuss relationships, political problems, and workplace schemes away from City Hall. That combination of comfort food and municipal gossip makes JJ's Diner part of the show's social geography rather than just a one-off restaurant.
A common mix-up is confusing JJ's Diner with Tom Haverford's later restaurant, Tom's Bistro, or with Paunch Burger, the fast-food chain. Those are separate Pawnee establishments. JJ's Diner is the one most closely linked with Leslie's waffles.