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menuAddOn

A Schema.org Property
Additional menu item(s) such as a side dish of salad or side order of fries that can be added to this menu item. Additionally it can be a menu section containing allowed add-on menu items for this menu item.
Values expected to be one of these types
MenuItem
MenuSection
Used on these types
MenuItem

Source

https://github.com/schemaorg/schemaorg/issues/1541