One example of something people cook that isn't food is "Polymer Clay." Polymer clay is a type of modeling clay that becomes solid and durable when baked in an oven. It is commonly used for various crafting and artistic projects, such as sculpting figurines, making jewelry, creating decorative items, and more.
Polymer clay is made up of PVC (polyvinyl chloride) particles mixed with a liquid plasticizer to give it a malleable consistency. Once the desired shape is sculpted, it is then placed in a regular household oven and baked at a specific temperature and duration according to the manufacturer's instructions. The baking process cures the clay, transforming it into a hard and permanent form.
While the final result might look like something you could eat, it's important to remember that polymer clay is not edible and should not be confused with actual food. It's a versatile and enjoyable material for many creative projects, but it should always be used for artistic purposes only.