By Mo Willems, Author & Illustrator. Gerald is careful. Piggie is not. Piggie cannot help smiling. Gerald can. Gerald worries so that Piggie does not have to. Gerald and Piggie are best friends. In I Really Like Slop!, Piggie invites Gerald to try her favorite food . . . slop. But Gerald is not so sure he’s going to like it. At all. For ages 3 and up.