The kitchen sink is an internal recipe used for testing the full Silverstripe CMS feature sets, including optional and suggested modules.
You can create a project using Composer:
composer create-project silverstripe/recipe-kitchen-sink ./cms-sink ^4
See the recipe plugin page for instructions on how Silverstripe CMS recipes work.
When installing the kitchen sink, your project Page and PageController subclasses may be set to extend SiteTree and ContentController. This is only an issue with the kitchen sink recipe, and requires you to manually change the parent classes to CWP's BasePage and BasePageController.