alexdaniels.me/templates/brain/menu/menu.html.twig

<nav>
    <menu class="level-1">
        <li class="level-1--item item"><a href="/">Home</a></li>
        <li class="level-1--item item"><a href="/brain">Brain Home</a></li>
        <li class="level-1--item sub-menu">
            <a class="sub-menu--link" href="/brain/post/list">Posts</a>
            <menu class="level-2">
                <li class="level-2--item"><a href="/brain/post/new">Add New Post</a></li>
            </menu>   
        </li>
        <li class="level-1--item sub-menu">
            <a class="sub-menu--link" href="/brain/page/list">Pages</a>
            <menu class="level-2">
                <li class="level-2--item"><a href="/brain/page/new">Add New Page</a></li>
            </menu>
        </li>
        <li class="level-1--item sub-menu">
            <a class="sub-menu--link" href="/brain/photos/list">Photos</a>
            <menu class="level-2">
                <li class="level-2--item"><a href="/brain/photos/new">Add New Photos</a></li>
            </menu>
        </li>
        <li class="level-1--item sub-menu">
            <span class="sub-menu--link">Taxonomy</span>
            <menu class="level-2">
                <li class="level-2--item"><a href="/brain/category/list">All Categories</a></li>
                <li class="level-2--item"><a href="/brain/category/new">Add New Category</a></li>
                <li class="level-2--item"><a href="/brain/tag/list">All Tags</a></li>
                <li class="level-2--item"><a href="/brain/tag/new">Add New Tag</a></li>
            </menu>
        </li>
    </menu>
</nav>