In a medium saucepan, combine the lentils and vegetable broth or water. Bring to a boil over medium-high heat, then reduce heat to low, cover, and simmer for about 20-25 minutes or until lentils are tender but still hold their shape. Drain any excess liquid and set aside to cool.
In a large mixing bowl, combine the cooled lentils, red bell pepper, cucumber, red onion, olives, feta cheese, and parsley. Toss gently to combine all the ingredients.
In a small bowl, whisk together the olive oil, lemon juice, dried oregano, salt, and pepper until well mixed.
Pour the dressing over the lentil mixture and toss until everything is evenly coated. Adjust seasoning if necessary.
Allow the salad to sit for at least 15 minutes to let the flavors meld before serving.
Notes
Allow the salad to sit for at least 15 minutes before serving to enhance the flavors.