This hearty, flavor-packed salad is a make-ahead champion that improves as it rests. It combines tender lentils with crisp vegetables, briny olives, and tangy feta, all tossed in a bright lemon-herb dressing. It's a complete, satisfying meal or a vibrant side dish that's both healthy and delicious.
For best texture, ensure lentils are completely cool before mixing. Salad keeps well in the fridge for up to 4 days. For a dairy-free version, omit the feta or add avocado just before serving.