src/Knp/Menu/Twig/MenuExtension.php
public function render($menu, array $options = array(), $renderer = null)
    {
        return $this->helper->render($menu, $options, $renderer);
    }
public function render($menu, array $options = array(), $renderer = null)
    {
        return $this->helper->render($menu, $options, $renderer);
    }
Renders a menu with the specified renderer.

@param ItemInterface|string|array $menu
@param array                      $options
@param string                     $renderer

@return string