Access Grav functions outside directory

I have Grav installed to a subfolder of our web root (/blog). What must I include in a file outside of Grav's root in order to access Grav functions?

On our homepage, which is not within the Grav directory, we have a "Recent Blog Posts" widget. I'd like to use Grav syntax to display the 3 latest posts. I assume I can just build a function to dig into the Grav directory and grab the latest pages, but it'd be nice to use Grav's built-in functionality to accomplish this.

Hi there! So, you wish to use Grav functions on non-Grav website? I'm afraid this won't be possible...
But you can rather easy do it via RSS or ATOM feeds perhaps?

Without writing an API in a plugin (examples already exist of this), you'd have to parse Grav-generated feeds as MakaryGo suggests or parse files. Those are the only three avenues for obtaining this data.

Well, accessing and parsing *.md files shouldn't be programatically complicated but... Perhaps it would be easier to move entire site to grav? 😛

Parsing the RSS feed with PHP worked just fine. Thanks for the suggestion @MakaryGo.

@MakaryGo:
Perhaps it would be easier to move entire site to grav?

Ha, I'd love to, but at this point the main site is already too far along to migrate.

Always happy to help 😊