Next time you go in, ask for a card to get coupon notifications.
There is a sign up card in the folio when they present your bill. Fill it out & leave it with your payment.
They always include the card to sign up with the check. Alternatively, you can just ask them for the sign up card.
When you visit and eat, give them your email address
I don't know if you can. I've never seen an option for this particular restaurant
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