Preheat the oven to 425 degrees and line a baking sheet with parchment paper.
Add all of the potato ingredients to a bowl and toss to coat. Transfer to the baking sheet and place in the oven for 20 minutes (on the center rack), flipping halfway. Remove from the oven and allow to cool slightly.
While the potatoes are cooking, prepare the dressing. Add everything to a bowl and whisk until combined. Taste and adjust the seasonings as needed. Set aside.
To assemble, add the kale, lentils, onions, parmesan & parsley to a large bowl. Pour over ¾ of the dressing and toss to coat. Top with the potatoes.
Serve chilled or at room temperature with the remaining dressing on the side.
