What's in our Volcano Roll? It's a spicy tuna roll topped with tempura rock shrimp and dressed with a basil oil. We don't use basil oil very often but we find that it complements the tempura rock shrimp very well. This is definitely not your typical basic sushi roll. It's got some different flavors and textures going that are not found in traditional sushi rolls. Why is it called a Volcano Roll? Because it's erupting with flavors and they all kinda look like a group of volcano islands sushi bites. Yeah, that's the best description for them. Volcano islands sushi bites.