Fill the jars: Place 3 (32-ounce) Mason jars in a row. To each jar, add 4 tablespoons dressing, 1 cup chopped cucumber, ¾ cup bell pepper, ½ cup red onion, ⅓ cup celery, 1 cup lentils, ¾ cup farro (or 1 ⅓ cups quinoa), ⅓ cup peanuts, and ⅓ cup parsley. 1 to 2 servings/jar.