You may want to require guests to spend a certain dollar amount in order to use a redeemable. This incentivizes guests to purchase more and try menu items they may have not tried previously.
While configuring the Qualification Criteria you can add a Subtotal Amount Receipt Qualifier set to "is more than or equal to", for ex: $15. This example requires the guest to spend $15 or more in order for a guest to use the redeemable.