With any leftover tahini, be sure to put in an airtight container and refrigerate. The tahini should last for at least 2 weeks in your refrigerator covered.
Tahini (also known as Ardeh) is a popular Mediterranean, Middle Eastern, & African condiment--a sauce made simply from toasted ground sesame seeds. It can be used for hummus, baba ganoush, etc.
You can buy tahini at your local grocery store, but bottles are typically very expensive. (I found one at a local discount grocery store for $8 a bottle.) For the few minutes it takes (and basically just the really cheap cost of seeds), making this is a no-brainer. You can leave the tahini in an airtight container and store it in the refrigerator for up to 2 weeks (possibly longer).
Be sure to use hulled sesame seeds (versus unhulled), or else your tahini will come out with a much bitter flavor.
Feel free to experiment with this base hummus recipe to create new flavors such as: roasted red pepper, jalapeno cilantro lime, roasted beetroot, etc.