Prep the radishes: Rinse, trim the tops and tails, and cut radishes in half. If you have any very large ones, quarter them so pieces are roughly the same size.
Preheat the air fryer: Set it to 400°F (200°C) for 3–5 minutes.
A hot basket helps the edges crisp.
Toss with oil and spices: In a bowl, combine radishes with olive oil, salt, pepper, and smoked paprika (if using). Coat evenly.
Air fry: Spread radishes in a single layer in the basket. Cook for 12–15 minutes, shaking the basket halfway through.
They’re done when fork-tender with lightly browned edges.
Make the butter finish: While radishes cook, melt the butter in a small pan over low heat. Add minced garlic and cook 30–60 seconds until fragrant—don’t brown it. Remove from heat and stir in lemon juice.
Toss and finish: Transfer hot radishes to a bowl.
Pour the garlicky lemon butter over top and toss to coat. Sprinkle with chopped herbs and a pinch of flaky salt if you like.
Serve: Enjoy immediately as a side with roasted chicken, steak, fish, or a simple omelet. They’re also great on grain bowls.