Beverly Lewis 
Green Gravy (Cul-de-Sac Kids Book #14) 

Carly Hunter is proud to be chosen "Student of the Week." She even gets to make a special wish–just in time for St. Patrick’s Day. Carly decides her classmates must wear green because she’s Irish. And she wants everyone to eat only green foods, too, during lunch.But Jimmy, her adopted Korean brother, doesn’t want to join the silly custom. He thinks green foods are yucky.Who will win this brother-sister tug-of-war?