Depends when. Off peak hours - definitely not. During rush hours - better to have one.
Need, no, but you could potentially have to eat somewhere besides at the grill if you don't make one. They're very accommodating and will find a way to seat you anyhow, though!
Nope. But it helps
A reservation is recommended especially for the grill...
You do not need a reservation but a reservation will get you seated faster
Most of the time no but its always better to call still.
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