Chop the onion, cut the sausage into thin cubes. Peel the pepper from the seeds and finely chop it.
Add the boiled beans. Grate the cheese on a medium grater, cut the cucumbers into strips.
Cut the tomatoes into thin slices and set aside. In a bowl, mix soy sauce and vegetable oil. Season the salad and mix it gently. Place the sliced tomatoes on top of the salad on a plate. Optionally, you can decorate with sprigs of cilantro.