2 bunches medium radishes (such as red, pink, and purple; about 20)
1 1/2 tablespoons olive oil
Coarse kosher salt
2 tablespoons (1/4 stick) unsalted butter
1 teaspoon fresh lemon juice
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Preheat oven to 450°F. Brush large heavy-duty rimmed baking sheet with olive oil. Cut off all but 1/2 inch of green radish tops; reserve trimmed tops and rinse them well, checking for grit. Coarsely chop radish tops and set aside. Cut radishes lengthwise in half and place in medium bowl.
Add 1 1/2 tablespoons olive oil and toss thoroughly to coat. Place radishes, cut side down, on prepared baking sheet; sprinkle lightly with coarse salt. Roast until radishes are crisp-tender, stirring occasionally, about 18 minutes. Season to taste with more coarse kosher salt, if desired.
Melt the butter over medium-high heat. Add pinch of coarse kosher salt to skillet and cook until butter browns, swirling skillet frequently to keep butter solids from burning, about 3 minutes. Remove skillet from heat and stir in fresh lemon juice.
Transfer roasted radishes to warmed shallow serving bowl and drizzle brown butter over. Sprinkle with chopped radish tops and serve.