My mom introduced me to black bean soup several years ago and now I make it on a regular basis. I have soaked dried beans and used them, but I have found that canned organic beans make the best soup. Kroger carries a brand I like, Private Selection. The only ingredients are organic black beans, water and sea salt. One 15 oz can contains 130 mg of sodium.
I start by sauteing chopped onion, celery, carrots and garlic in olive oil. Then I add a cup of red wine and let it simmer until the wine reduces. I add 4 cans of beans, a 10 oz can of Ro*Tel Diced Tomatoes and Green Chilies after draining the liquid (if you like it hotter just add the liquid), a 15 oz can of Private Selection Organic Sweet Corn and 1 qt of Imagine Organic Free Range Low Sodium Chicken Broth. Grind a little black pepper and sea salt to taste. A little salt is needed since the ingredients are low sodium. Sea salt is best since it has trace minerals and lower sodium content.