Canned black olives may contain chemicals that turn them black artificially. Kalamata is a large, black olive, named after the city of Kalamata, Greece, used as a table olive. These olives are of a smooth and meatlike taste. Empeltre is a medium sized, black olive grown in Spain. They are used both as a table olive and to produce a high quality olive oil.
Green olives are allowed to ferment before being packed in a brine solution. Black olives are not fermented, which is why they taste milder than green olives. Picholine originated in the south of France. It is green, medium size, and elongated. Their flavour is mild and nutty.
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