I made a dipping sauce by combining a cup of Hoisin Sauce with about 1/4 cup peanut butter and 2 TBSP of rice vinegar.
Helena loved making them and became the master roller after a few tries. We brought them to a picnic and they went fast. Mmmm, really worth a try if you like this sort of thing. Also, vegan in this case (though they'd be great with chicken or shrimp too!), and gluten-free.