Spicy Skirt Steak With Avocado Dipping Sauce

Reserved cucumber (from Spicy Skirt Steak with Avocado Dipping Sauce), sliced   1  miniature yellow sweet pepper, sliced   1  small shallot, sliced   ¼ cup chopped red sweet pepper   2 tablespoon lime juice   1 tablespoon olive oil   1 tablespoon chopped fresh dill     Salt     Ground black pepper