Cook the pasta according to package instruction, drain and immediatly put it under cold running water to stop the cooking process (this little trick allows the pasta to be cooked but firm for the salad). Set aside.
Heat the olive oil in a skilled over medium heat.
Add the bell pepper and sauté for approximately 10 minutes or until cooked, mixing frequently. Remove from the heat and let cool.
For the pistou, mix the basil and salt in a blender or food processor until a thick paste forms. Slowly add the olive oil until you get a smooth green paste.
Finally transfer the pasta into a big bowl or serving plate and add in the red bell peppers and its delicious juice gently mixing everything in order for the pasta to absorb all the flavour.
Serve cold, topped with a generous drizzle of the pistou. Put the rest of the pistou in a small bowl and serve it along with the pasta salad.