Fix yourself a virgin bloody mary or make a flavorsome spaghetti sauce. Concentrated forms of tomato provide more potassium—there's approximately 162 mg in a tablespoon of tomato paste. A cup of stewed tomatoes or 100% tomato juice offers 528 mg of potassium, but if you're buying a can of stewed tomatoes, be mindful of the sugar content.
One medium-sized fresh tomato would give you about half this amount of the mineral. In addition, tomatoes are sources of vitamins A and C.

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