Need ViewPublic Help

Hello Everybody,
I'm Trying to Create a plugin, And stuck in ViewPublic
How Can I Show List Of Posts Via ViewPublic ?
Please Fix My Code

class Custom_ViewPublic_Index extends XenForo_ViewPublic_Base
{
    public function renderHtml()
    {
        $db = XenForo_Application::get('db');
        $sql = $db->fetchAll("SELECT * FROM custom_item");
        foreach ($sql as $item) {

            //What to Do

        }
    }
}

PHP:

I Have to Show Like This
<ul>
<li>Title Num 1</li>
<li>Title Num 2</li>
<li>Title Num 3</li>
</ul>