How to customize KNPMenuBundle?

I can't figure out how to add an image or a span tag using the KnpMenuBundle.

I simply want this:

<ul>
    <li>
         <img src="{{asset('bundles/mybundle/images/my_image.png')}} /">
         <span>My Title</span>        
     </li>
</ul>

In the MenuBuilder, this would start with:

$menu->addChild('My Title');

How could I add the image in the <li> statement?

EDIT: THE EASY WAY

There is actually an easy way to do this within the bundle:

1 Copy the template vendor\KnpMenu\src\Knp\Menu\Resources\views\knp_menu.html.twig into your Acme\AcmeBundle\Resources\views\Menu\knp_menu.html.twig and extend it as follow:

{% extends 'knp_menu.html.twig' %}


2 Modify the template according to your needs. For example, if you decide to add a span tag each time you use $menu->addChild('Your Title');, simply add the span tag between <a></a>:

{% block linkElement %}
    <a href="{{ item.uri }}"{{ _self.attributes(item.linkAttributes) }}>
        <span>{{ block('label') }}</span>
    </a>
{% endblock %}


3 You can now choose your custom layout when using the menu:

{{ knp_menu_render('main', {'template': 'AcmeBundle:Menu:knp_menu.html.twig'}) }}
symfony knpmenubundle
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