Coffee giant Starbucks is disclosing its long-held “secret menu” to Starbucks Rewards members starting Monday, July 14.

The feature, available in the “offers” tab of the Starbucks mobile application, will allow customers to order four popular beverage combinations that are normally not listed on the chain’s regular menu, at participating stores: cookies on top, dragonfruit glow-up, lemon tea and pearls, and just add white mocha.

To bring attention to the promotion, Starbucks is offering customers the opportunity to submit their favorite drink customization for a chance to have their creation featured on the secret menu and win a $25,000 grand prize.

The competition—which runs for one week only, ending at 11:59 p.m. PT July 20—will see entries narrowed down to four final beverage customizations. Fans will be able to vote for their favorite combination on Starbucks’ Instagram page from Aug. 18 through 20.

Each of the four finalists will have their beverage customization featured on the secret menu from Aug. 18 through 25 and receive a $5,000 prize, and the grand prize winner will receive an additional $25,000.