Dear Steff,
We have reviewed your website and we found you are using a 3rd party plugin for extra add-ons. That’s why the addons were not included in the printing. Also, the add-ons are not showing in the product details (popup) here https://takeawaypenzance.com/foodbook/
For your kind information, FoodBook is an individual plugin for its purpose. It’s a complete system including various features. FoodBook already has its own extra features adding system. That’s why FoodBook does not support any 3rd party plugin except the WooCommerce plugin.
If you need to add an extra addon like extra cheese or something else then please use the FoodBook feature. Please check our this doc https://themelooks.net/documentation/plugin/foodbook/how-to-add-product-extra-items
Best Regards,
ThemeLooks Support Team