Difference Between Sashimi and Sushi - as part of the expert series by GeoBeats. The difference between sashimi and sushi is sashimi basically means "sliced raw protein." Usually it means "sliced raw fish" like tunas, salmon, but in Japan we use other protein such as horse. The horse sashimi exists and it is basically sliced horse meat served with soy sauce and wasabi. On the other hand, sushi, right here, is a combination of rice and sashimi. So this one is tuna, or maguro sushi, and it has tuna sashimi on top and rice on the bottom. So that is the difference.