Pizza Ovens - How to make them and bake in them! Wonderfully simple oven made with cob (clay and sand mix), this is hands-on, outdoor, creative fun. Jessica runs regular courses at Holt Hall in Norfolk for public, family and corporate groups. She also makes them in school settings, facilitating whole-school involvement in the process of making a complete oven from scratch, either with infant school children (John of Gaunt Infant and Nursery School, Aylsham), 6 - 10 yr olds (Taverham Hall Prep School, Norfolk), Outdoor Learning SEN students (Aylsham High School), or vulnerable adults (Thornage Hall, Norfolk). Pizza ovens (sometimes called Earth ovens or Cob ovens) can cook much more than just pizza's, they are also excellent for slow roasts, bread and any baked foods.