Preheat your oven to 200°C (390°F). Gather a baking sheet, a sharp knife, and a mixing bowl.
Trim the greens off the radishes if they are still attached, then wash the radishes thoroughly to remove any dirt. Pat them dry with a clean towel.
Cut the radishes in halves or quarters depending on their size, aiming for even pieces so they roast uniformly.
In the mixing bowl, toss the radishes with chopped garlic, olive oil, salt, pepper, and chopped herbs until they are evenly coated and fragrant.
Arrange the seasoned radishes in a single layer on the baking sheet, making sure they aren’t crowded to promote even caramelization.
Place the baking sheet in the oven and roast for about 25-30 minutes, flipping the radishes halfway through, until they are golden brown and slightly caramelized at the edges.
Check for doneness: the radishes should be tender when pierced with a fork, with fragrant aroma and crispy, caramelized edges.
Remove the radishes from the oven and let them rest for a couple of minutes. Squeeze fresh lemon juice over them or add lemon zest for brightness if desired.
Serve the roasted radishes warm, garnished with extra herbs if you like. Their tender interior, smoky flavor, and crispy edges make a delightful side or snack.