Calling a plugin within a twig

   enabled: true
   theme: default

   <?php
namespace Grav\Plugin;

use Grav\Common\Page\Collection;
use Grav\Common\Plugin;

class LatestPlugin extends Plugin 
{
    public static function getSubscribedEvents() {
    return [
        'onPluginsInitialized' => ['onPluginsInitialized', 0],
    ];
} 

    public function onPluginsInitialized() {
        /** @var Uri $uri */
        $this->enable([
               'onPageInitialized' => ['onPageInitialized', 0]
            ]);
    }

    public function onPageInitialized()
    {
            $this->latestPages(1);
    }

    public function latestPages($count = 10)
    {
        /** @var Pages $pages */
        $pages = $this->grav['pages'];
        $latest = array();

        foreach ($pages->routes() as $url => $path) {
            $page = $pages->dispatch($url);
            if ($page && $page->routable()) {
                $latest[$page->route()] = ['modified' => $page->modified(), 'page' => $page];
            }
        }

        // sort based on modified
        uasort($latest, function ($a, $b) {
            if ($a['modified'] == $b['modified']) {
                return 0;
            }

            return ($a['modified'] > $b['modified']) ? -1 : 1;
        });

        // build new array with just pages in it
        // TODO: Optimized this
        $list = array();
        foreach ($latest as $item) {
            $list[] = $item['page'];
        }

        $this->grav['debugger']->addMessage(array_slice($list, 0, $count)[0]);

        return array_slice($list, 0, $count);
    }
}

        <ul>
            <li>THE PLUGIN SHOULD SHOW DATA HERE </li>
            {% for posts in latestPages(1) %}
                <li>{{ posts.route }}</li>
            {% endfor %}
            <li>AND WOULD FINISH HERE</li>
        </ul>

    public function onTwigSiteVariables() {
    $this->grav['twig']->latestPages = $this->latestPages(1);
}

{% for posts in latestPages %}