Sprinkle the Olives Quickly With the Flat Side of the Knife
Nowadays, there are many special tools for peeling, removing seeds and grinding various parts of plants, including seeds for olives. It turns out that you don’t need a special universal tool to break an olive, you just need a knife.
To easily crush a whole bunch of pitted olives, simply take the flat blade of a large knife (or a spatula, or potato holder, saucer, any flat thing will do) and crush them. The pit will pop out, leaving the flesh behind. The result isn’t as pretty as the pitter, but it’s done, and I bet you already have a knife (or spatula, or saucer, or flat thing) in your kitchen.
The Best (And Worst) Ways To Lay Out Pitted Olives | Food 52