A Magic Steeped in Poison (Book of Tea #1) by Judy I. Lin

Hardcover with dust jacket.

Synopsis: For Ning, the only thing worse than losing her mother is knowing that it's her own fault. She was the one who unknowingly brewed the poison tea that killed her - the poison tea that now threatens to also take her sister, Shu.

When Ning hears of a competition to find the kingdom's greatest shennong-shi - masters of the ancient and magical art of tea-making - she travels to the imperial city to compete. The winner will receive a favor from the princess, which may be Ning's only chance to save her sister's life.

But between the backstabbing competitors, bloody court politics, and a mysterious (and handsome) boy with a shocking secret, Ning might actually be the one in more danger.