Blast Raz are a type of fruit that looks very similar to a grenade. They share similarities with Grenapes and Bombergranates, and may possibly be in the same family of fruit.
They explode when handled improperly, and the only way to keep this from happening is by singing. In the episode of the same name, Gazpacho and the gang had to deliver Blast Raz fruit to Mr. Fugu by a dangerous road called Route 17.