01 - Preheat oven to 425°F. Line a baking sheet with parchment paper or a silicone baking mat.
02 - In a mixing bowl, toss the halved radishes with olive oil, minced garlic, sea salt, and black pepper until evenly coated.
03 - Spread the seasoned radishes cut-side down in a single layer on the prepared baking sheet, ensuring even spacing for proper caramelization.
04 - Roast for 20 to 25 minutes, stirring once halfway through, until the radishes are golden and fork-tender.
05 - Transfer the roasted radishes to a serving dish. Sprinkle with fresh parsley and Parmesan cheese if desired. Serve warm.