Preheat your oven to 200°C (390°F). Line a baking sheet with parchment paper to keep things tidy and ensure even roasting.
Wash and thoroughly dry the radishes. Trim any greens if attached, then cut larger radishes into halves or quarters so they cook evenly.
In a mixing bowl, toss the radishes with olive oil until each piece is well coated. This helps them caramelize beautifully in the oven.
Season generously with salt and freshly cracked black pepper, tossing again to distribute evenly.
Spread the radishes in a single layer on the prepared baking sheet, making sure they aren’t crowded to get that crispy, caramelized edge.
Roast in the oven for about 20-25 minutes, shaking the pan or flipping the radishes halfway through to promote even browning.
Watch for the edges to turn golden and crispy, and for the radishes to feel tender when pierced with a fork.
Remove the radishes from the oven and immediately sprinkle the freshly grated Parmesan over them, allowing it to melt slightly from the residual heat.
Let the radishes sit for a couple of minutes so the cheese can set and develop its flavor, then finish with a drizzle of olive oil and optional herbs or lemon for brightness.
Serve the radishes while still warm, enjoying the crispy edges and tender insides with the rich Parmesan topping.
