How to set the time zone?
To work time and date properly with your time you need to settings restrofood plugin timezone from restrofood settings and WP admin settings -> general
Restrofood settings option:

WP admin settings option:

Upload the xml file. Note: You should upload restrofood product xml first then restrofood media xml file
Item visibility is divided into several mealtimes- Breakfast, Lunch, Dinner, Snack, etc. The item which is being set for breakfast will not be visible as lunch, dinner, or snacks. The same goes for other mealtimes. Have a look at the below-attached screenshots. You’ll get a complete overview.
To use pre order system you need to set some settings from restrofood delivery settings. Please follow the screenshot. After set all settings you will find the date and time select option in checkout page How to hide delivery date and time from checkout page?
Set list type and min/mix required option. If you don’t set min or max required number this items are not required for the product to add to cart.
To add product nutrition information follow the screenshot : Preview:
No products in the cart.