Black beans are classified as legumes. Also known as turtle beans because of their hard, shell-like appearance, black beans are, in fact, the edible seeds of the plant.
Like other legumes, such as peanuts, peas, and lentils, black beans are prized for their high protein and fiber content. They also contain several other key vitamins and minerals that are known to benefit human health.
The night before, soak the black beans in a large pot of water. The next day, rinse the beans, cover with fresh water and bring to a boil over high heat. Reduce the heat and simmer covered for 30 minutes, skimming off any foam. Stir in chopped onion and simmer 30 minutes more. Add minced garlic, oregano, cumin, and red pepper flakes, and simmer uncovered for 30 minutes, stirring occasionally. Stir in a dash of white wine (or apple cider) vinegar, and taste before seasoning with salt and pepper. Freeze leftovers.