There are 2 different ways for you to add a recipient to the group order. 

Option 1: You may send them the group lunch link. How?

> Navigate to Calendar> Go to the date of your group lunch.
> See Group Order Link:

Option 2: Add them to the group lunch contact list:

> Navigate to Calendar> Go to the date of your group lunch.
> Click on the Edit button (Pencil Icon)
> Add recipients under "Guest Details"

See video below for references:

https://www.useloom.com/share/8cc21d9aad6b4cdea487d33ea6c71dda

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