01 - Place rinsed lentils, water, bay leaf, and salt in a medium saucepan. Bring to a boil over high heat, then reduce heat and simmer uncovered for 20-25 minutes until lentils are tender but not mushy. Drain well and discard bay leaf. Allow to cool slightly.
02 - In a large mixing bowl, combine the cooled cooked lentils, cherry tomatoes, cucumber, red onion, bell pepper, Kalamata olives, and fresh parsley. Mix gently to combine.
03 - In a small bowl or jar, whisk together the extra-virgin olive oil, fresh lemon juice, dried oregano, minced garlic, Dijon mustard, salt, and freshly ground black pepper until emulsified and well combined.
04 - Pour the prepared dressing over the lentil and vegetable mixture. Toss gently with a large spoon or tongs to distribute the dressing evenly throughout.
05 - Add the crumbled feta cheese and toss lightly to incorporate. Taste the salad and adjust seasoning with additional salt or pepper as needed.
06 - Serve immediately at room temperature, or cover and refrigerate for up to 2 hours to allow flavors to meld before serving.