In a medium mixing bowl, gently toss together lentils, red onion, feta cheese, cucumber, spinach, dill, tomato, and parsley.
1 cup lentils, ¼ cup red onion, 1 tbsp feta cheese, ½ medium cucumber, 1 ½ cup spinach, 1 tbsp dill, 1 cup cherry tomato, ¼ cup parsley