The Three Broomsticks is a counter service restaurant in The Wizarding World of Harry Potter at Universal's Islands of Adventure. It's a top quality meal.
A counter-service restaurant serving fish and chips, shepherd's pie, Cornish pasties, smoked chicken, turkey legs, ribs, from $8-15. There's a "Great Feast" of salad, smoked chicken and ribs, corn on the cob, roasted potatoes, that serves four for $50. You can buy your Butterbeer with or without a meal in here, too, providing another option to get your sugar fix on. (By the way, we know that Butterbeer does include sugar, and not high fructose corn syrup. J.K. Rowling demanded that Universal not use HFCS in any Wizarding World food. That's why you can't order a Coke in The Three Broomsticks.)
If the restaurant looks familiar, it should. The production designer for the Harry Potter movies, Stuart Craig, worked with Universal Creative to design the restaurant while the Wizarding World was in development. Craig later recreated this look for the interior scenes of The Three Broomsticks in the later Harry Potter films.