In my experience, some of the “sesame pastes/sauces” you find in the local supermarkets have some additional ingredients which causes the hummus to taste strange. However, the Santa Cruz chain of shops has an excellent 100% white sesame paste (uni-president) which I find works well for hummus.
Take this time to thank the gods of international commerce and the architects of the Silk Road.
Tahini has simply become interchangeable with sesame paste. Tahini can be seen as “more prepared” version with added olive oil and garlic. Sesame paste is just ground sesame seeds.
Yes, you can you sesame paste in place of it. Don’t cheap out on this. Get the stuff freshly ground. There are shops all around Taiwan that do that. If you are really clever you can make a souped up halva with black sesame seed paste! Oh, delish!
You can get Israeli tahini in Carrefour. I bought some a couple of weeks ago and made hummus with it. It says ‘with seasoning’ on the bottle, but I can’t taste anything except sesame. The hummus turned out great.
AFAIK tahini should not have anything at all in it except sesame. I’ve tried grinding up sesame seeds. It works, and it tastes … well, like tahini. You just need to make sure you get ‘raw’ sesame seeds, not ones that have been roasted or otherwise processed.
Hummus is hmm, actually a paste the way you want to make it, to your own taste, no rules, a million recipes. I made some wonderful hummus pastes over the years, all different, but still hummus. Sesame past is bitter, so watch out if you don’t want that, use it sparingly.