They're part of Sanger's "World Snacks" series, and along with exposing little ones (they're all board books, horray!) to many foods, and bouncing along with cute, rhymes, the illustrations are detailed, clever paper sculpture/collages of each dish. And often the foods are shown as babies see them--filling sippy cups or sitting on high chair trays.
Avocado slices preped for sushi rolls, paper wrappers around dumplings, and my favorite, lox on bagels. Clever and mouthwatering.
The collages remind me of the play food that kids in an after-school program I once worked at would make from construction paper. I remember egg rolls, where the kids would carefully cut out all of the ingredients, wrap them in brown paper and fasten with tape. In the end you only saw the outside, but they knew they had made their egg rolls the way their parents did at home.