In a well-seasoned cast-iron skillet, heat oil over medium heat.
Add garlic, rosemary, potatoes, and greensand toss well to combine. Sauté until greens wilt, 4 minutes.
Then smash the mixture down to a pancake shape with a spatula. Continue to cook for another 3-4 minutes, then sprinkle with Parmesan and serve hot as an accompaniment to grilled meats.
You can also serve the sauté with corn bread and a bowl of bean soup.
Servings: 4