Heat the oil in a skillet or saucepot over medium heat. Then add the onion and cook, stirring occasionally, about 10 minutes or until golden and soft.
Add the tomato paste and cook about 1 minute, stirring.
Add the beans, corn, potatoes, water and salt. Bring to a boil.
Reduce heat to medium and simmer, stirring occasionally, about 25 minutes or until the potatoes are soft and most liquid has been absorbed.
Enjoy with your family!