Rinse and drain the canned butter beans under cold water. Set aside.
Chop the onion, carrots, bell pepper, garlic, and parsley (or celery).
In a large pot or deep skillet, heat the olive oil over medium heat.
Add the chopped onion and garlic. Sauté until the onion becomes translucent.
Stir in the diced carrots, bell pepper, and chopped parsley (or celery). Cook for a few minutes until the vegetables start to soften.
Add the canned chopped tomatoes and tomato paste to the pot. Stir well to combine.
Season with salt and pepper according to taste. Crumble the vegetable cube into the mixture and stir.
Pour in the water and bring the mixture to a gentle simmer. Allow it to cook for about 10-15 minutes, letting the flavors meld together.
Gently fold in the canned butter beans, ensuring they are well-coated with the tomato and vegetable mixture.
Let the Gigantes simmer over low to medium heat for an additional 15-20 minutes, allowing the beans to absorb the flavors.
Taste and adjust the seasoning if necessary. You can add more salt or pepper based on your preference.
Once the beans are tender and the flavors have melded, remove the pot from heat.
Serve the Gigantes warm, optionally garnished with additional fresh parsley.