That’s already built-in… no need for a shortcode other than the main shortcode that shows the sheets. If you’re using the Item Details field (which was setup exactly for your type of situation) to have people specify the dish, then that should show up in the list of signups for each task as long as you have NOT checked the box to “Hide Details and Quantities” in the main settings.
If, instead, you are making a task for each specific dish and having people signup for a specific dish that you already defined, then the main list of signups and available slots for the sheet would show everyone who has signed up, unless you are checking the option to hide volunteer names from public.
Please read through the documentation carefully, as I would just be repeating myself here, and this is NOT the support forum for the main plugin anyway.
Please read through the documentation for all the general settings so that you know what each one does. As mentioned in my first reply, make sure you do NOT have the option checked to hide volunteer names from public.