What do you bring to a friendship? What do you have to give? What do you need that only friendship can provide? In Sweet Sour Bitter: A Tale of a Friendship, a Transplant, and a Lemonade Stand, lifelong friends tell their story of how an impending liver transplant shaped their lives.. It isn't a manual on how to be a friend or how to bear illness, or how to be a caregiver. It's not an inspirational story of triumph against a debilitating physical illness--we, the co-authors don't even know how that part ends. It's an offering to our readers, a tale that we hope will inspire them to see the richness of their own stories, friendships, and lives.