American scientists have bred a new strangely- colored variety of tomatoes called Indigo Rose, which is being heralded as a new superfood with even greater health benefits than normal red varieties.

The scientists found some tomatoes with purple pigmentation and tests revealed that an antioxidant called anthocyanin was providing the color, the same as that of blueberries. They crossed the purple tomatoes with some wild tomatoes and eventually came up with a black strain.

During the growth process, Indigo Rose starts out green like all tomatoes but when the sun hits the fruit, it turns black rather than red.

Dark tomatoes are not as sweet as normal red tomatoes and have a more savory flavor.

Black tomatoes are said to be healthier than their red cousins as they have more anti-oxidants to help fight diabetes and obesity.

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