Cook the beans once in a pressure cooker using steam, then release the steam normally (without removing the lid). Afterward, continue cooking the beans normally (without steam) for about 20 minutes, until they are tender but still have a little bite.Then drain the beans, rinse with cold water and let them cool Meanwhile, peel the carrots, cut them into cubes, put them in a pot with a little salt or broth, cover with water and bring to a boil
Clean the bell peppers and dice them, add them to the now-boiling carrots, and cook for about 2 more minutes. Then rinse with cold water, drain, and set aside
Chop the tomatoes, cucumbers, onions and spring onions as well and set them aside
In a small bowl, combine mustard, oil, lime juice, salt and pepper and mix well to make a nice vinaigrette
Now, in a large bowl, add the beans, carrots, bell peppers, tomatoes, cucumbers, onions, spring onions, and vinaigrette one after the other, and gently mix well. Let it sit for about 10 minutes and serve cold