One of the http://schema.org/Recipe properties that we did not include with our Drupal Recipe content type is the
NutritionInformation property. The reason for that is because the
NutritionInformation property is itself an
itemType from http://schema.org, and as such is made up of a number of its own individual properties. In order to add
NutritionInformation to our custom Recipe content type, we are going to need to create a custom Drupal compound field module that is based on the specification at http://schema.org/NutritionInformation.