Hi Rebekka,
Have you looked at the Illinois Agriculture in the Classroom (
https://www.agintheclassroom.org/) website? If you want to some information to show where the ingredients for pizza come from you can check out the resources provided on their website page about Ag Mags and Readers (
https://www.agintheclassroom.org/teacher-resources/ag-mags-and-readers/). For an example take a look at the "Pizza" topic! They have a great Junior Ag Mag for 2nd through 4th, and a wonderful Facts for Little Readers K - 1st. Poke around on their website and you will find lots of inspiring resources.
I'm a special librarian that focuses on gardening, ag and environmental resources for children and youth. Let me know if you have any questions.
Have a great day,
Pam