Heat the vegetable oil in a frying pan and fry the sliced sausages.
Add the chopped onions and carrots (cut all the vegetables into large pieces). Fry all together until the carrots are soft over medium heat, not forgetting to stir.
Add the sweet pepper, mix and continue cooking for another 3-4 minutes.
Add the diced eggplant, stir the stew and cook for 8-10 minutes, not forgetting to stir.
Add sliced tomatoes (if desired, remove the skin), mix.
Add the beans (pre-drain the liquid from the jar), mix the stew, season with salt to taste, add black and red pepper and simmer for another 5-6 minutes, remove from the heat.