Nerigoma (ねりごま) is a paste made of hulled or unhulled toasted sesame seeds. It’s similar to tahini, but the difference is the length in roasting time. Even toasted tahini is not toasted for quite as long as nerigoma.
Nerigoma is really hard to find for me, so I’m assuming it might be a little hard for you too. Tahini is a perfectly suitable substitute, so go ahead and use it if it’s more available to you. My only tip, I would suggest mixing in some toasted sesame seeds with the tahini to really get the toasted flavor nerigoma is known for.Buy on Amazon