Dont have to make reservation but I recommend and they do sushi at grill table, ask for menu.
Someone in your party can order sushi in addition to the grill menu.
You do not have to make reservations, although if you're going on a weekend with a big group, I definitely would. Yes, they serve sushi at the grills as well.
It's better to have reservations so you don't wait but it depends what day and time you are going. Yes, they have a sushi bar as well.
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