Change product item HTML?

I’ve looked throught almost every single file in woocommerce directory but everything is very modular (as a modern code should be). I cannot figure out how to change the HTML of single product item (do not confuse with product page).

E.g shortcode [recent_products per_page="3"] generated something like this:

<ul>
    <li>
        <a>
            <img>
            <h3></h3>
            <span></span>
        </a>
    </li>
    <li>
        <a>
            <img>
            <h3></h3>
            <span></span>
        </a>
    </li>
    <li>
        <a>
            <img>
            <h3></h3>
            <span></span>
        </a>
    </li>
</ul>

Could any WooCommerce developer lend me a hand?