The Sandwich Swap by Queen Rania of Jordan Al Abdullah (2010)
Lily and Salma are best friends. They like doing all the same things, and they always eat lunch together. Lily eats peanut butter and Salma eats hummus-but what's that between friends? It turns out, a lot. Before they know it, a food fight breaks out. Can Lily and Salma put aside their differences? Or will a sandwich come between them?