Are there different styles of tahini?
"Tahini Sauce" and "Taratour Sauce", which are sauces based on tahini, are often simply called "tahini".  Generally the recipe is tahini, lemon juice, salt, and optionally herbs and/or garlic.

Example recipes:


http://mideastfood.about.com/od/dipsandsauces/r/tahinisauce.htm
http://chocolateandzucchini.com/archives/2009/11/simple_tahini_sauce.php