Saute the onions over medium-low heat in a medium sized, heavy pot that has a lid.
Slice the carrots into 1/8″ coins and add to pot.
Cut potato into 1/4″ dice and add to pot, stirring occasionally. Add water and loosen any stuff that has stuck to the bottom of the pot with a wooden spoon. Add salt, oregano, tomato paste and stir. Cover and turn head down to a low boil.
Slice and kale, drain and rinse the beans. Add beans to pot and stir. The stew should be quite thick. Add kale and lemon juice. Taste and season if necessary. Simmer for a few minutes until kale is tender.
Carrots should be tender, and the potato should be soft but still hold its shape. Serve and garnish with fresh herbs, shown here with thyme.