Preheat the oven to 425 degrees F.
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Wash the radishes and trim off the stems. Reserve a few leaves from the radishes and slice into thin strips for garnish. Halve the radishes and toss with the garlic, oil, and salt.
Line a baking sheet with foil and place radishes cut-side down. Place in the oven and roast for 20–25 minutes until tender when pierced with a fork.
Remove from the oven and toss with lemon juice and radish leaves.
