I found some wonderfully interesting information for you. When we were exploring the Castello Maniace on the point at Ortigia, Siracusa, we came across an exhibition of things discovered while excavating the ruins.
In the 16th century, with the discovery of gun powder, the first arms were invented. Hand bombs, or grenades, that were thrown manually after a fuse had been lit, were also developed. In order for the grenade to explode next to its target, it was given a triggering mechanism that provoked the explosion when it hit an object.
Now here is the interesting bit…originally these bombs were called grenades because they looked like pomegranates. (granata)
They were made out of metal or ceramic. They were circular with a hole where the gunpowder could be loaded.
It would be much safer just to throw pomegranates.