Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper to keep cleanup easy and prevent sticking.
Wash and trim the radishes, then slice them in half lengthwise. This ensures they roast evenly and develop beautiful caramelization.
In a mixing bowl, toss the radish halves with olive oil, making sure each piece is well coated. Sprinkle with a pinch of flaky sea salt and freshly cracked black pepper for flavor.
Spread the radishes evenly on the prepared baking sheet, cut side down. This contact helps them caramelize beautifully as they roast.
Roast the radishes in the oven for about 20-25 minutes, until they are golden and slightly crispy around the edges. Shake the pan or flip them halfway through to ensure even browning.
Once roasted, remove the radishes from the oven and immediately sprinkle freshly grated Parmesan cheese over the hot surface. The residual heat will help the cheese melt slightly into the radishes, creating a savory crust.
Let the radishes sit for 2 minutes so the cheese can melt and flavors meld. If desired, sprinkle with chopped fresh herbs for added freshness and aroma.
Serve the roasted radishes warm, with their crunchy Parmesan crust and tender interior creating a beautiful contrast. Enjoy as a flavorful side or a light vegetarian dish.