01 - 
                Wash and thinly slice the bell peppers. Peel and slice onions. Chop or crush garlic cloves. If using fresh tomatoes, chop them finely.
              
              
              
                02 - 
                Heat olive oil in a large skillet over medium heat. Add onions and cook for 5 to 7 minutes, stirring, until softened.
              
              
              
                03 - 
                Stir in the garlic and cook for an additional minute, releasing the aroma.
              
              
              
                04 - 
                Add sliced peppers to the pan, stirring to coat in oil. Cook for 10 minutes, stirring occasionally.
              
              
              
                05 - 
                Incorporate chopped tomatoes along with salt and black pepper. Stir well to combine.
              
              
              
                06 - 
                Cover skillet and reduce heat to low. Simmer for 25 to 30 minutes, stirring now and then, until vegetables are tender and flavors meld.
              
              
              
                07 - 
                Uncover, taste, and adjust seasoning. Add a splash of red wine vinegar if desired. Sprinkle with chopped fresh basil or parsley before serving.