Place the dried black beans, water, chopped onions, jalapeno, garlic, cumin and salt into a crock pot. Turn the crock pot onto low heat and cook 8-10 hours, or until beans are completely soft. If you don't have 8 hours, you can cook on high heat for 5-6 hours. Once the beans are soft, you can season the beans with extra salt, pepper and squeeze with a fresh lime. Serve in burritos, as a side dish, a chip dip or turn into a simple black bean soup and garnish with cheese, sour cream, etc.*If you don't want to use dried beans you can just use canned beans and use about 5-7 cans that have been drained. Add only as much water as you need to thin the beans a little bit. Cook the rest as the same and just simmer for 10-15 minutes, or until beans are warm. Serve warm.