Black olives? Green olives? Purple olives? A personal highlight from our spring trip to the farm was tasting the actual olives. This is where the magic comes from. In case you wonder why they are not black like those you know from the supermarket, black olives are a Californian marketing invention, they are processed to turn black with an alkaline solution and ferrous gluconate. The pure thing looks like these from out farm in Southern Peloponnese.