Tahini is a thick paste, very much like peanut butter. It's made by grinding sesame seeds, and it's a 'butter', or a fat, just like peanut butter is. You can buy tahini in just about any supermarket, but if you want raw tahini, truly raw, you have to go to a raw market or a health food store, and look for Rejuvenate tahini. They also sell hempini, and almond butter, and a few other raw butters.