Preheat the oven to 400F then line a large baking sheet with parchment paper.
Clean the potatoes, then cut them into small pieces. Place them into a large bowl with the cauliflower florets, rosemary, olive oil, and salt. Toss gently to combine.
2 lb baby potatoes,, 2 cups cauliflower florets, 3 sprigs fresh rosemary,, 2 Tbsp olive oil, 1 tsp sea salt
Arrange the veggies in a single layer on the parchment-lined sheet pan. Roast in the oven for 40-45 minutes. Stir or toss the mixture once halfway through. Roast until the potatoes are tender and cauliflower is golden brown, and caramelized on the edges.
While vegetables are roasting, wash the kale with cold water and dry it, then remove the thick stems. Using your hands, massage the chopped kale with a little bit of olive oil until it becomes tender, wilted, dark green, and the volume reduces. Set aside.
3 cups kale,
Combine olive oil, minced garlic cloves, Dijon mustard, red wine vinegar, lemon juice, sea salt, and ground black pepper in a small bowl.
¼ cup olive oil, 2 medium cloves garlic,, 1 Tbsp Dijon mustard, 2 Tbsp red wine vinegar, 1 Tbsp lemon juice, ¼ tsp sea salt, 1 pinch ground black pepper
When 40 minutes are up, put roasted cauliflower and potatoes into a large bowl and add the finely chopped tender kale. Toss everything together until the greens begin to wilt.
Add dressing and stir to coat. Serve at room temperature topped with extra rosemary if desired, and salt and pepper to taste.