In a large serving bowl, combine 1 14 ounce can lentils (drained), 2 cups baby arugula, 1 English cucumber (sliced thin), 3 radishes, 1/2 cup parsley, 2 tablespoons fresh mint, 1/4 cup pumpkin seeds.
In a small jar, whisk or shake together 2 tablespoons apple cider vinegar, 1 tablespoon lemon juice, 1 tablespoon balsamic vinegar. 1 tablespoon extra virgin olive oil
Crumble the feta cheese on top of the salad and garnish with extra mint leaves if desired.