Wash the radishes and trim the tops. If there are any larger sized ones, cut them in half so that all of the radishes are approximately the same size.
Toss the radishes in the olive oil, salt and pepper. Lay them out evenly cut side down on a baking sheet or in a cast iron skillet ensuring that they are in a single layer.
Roast for 20 to 25 minutes. Once golden and crisp, remove from the oven, sprinkle with the chopped parsley and a touch more salt. Serve warm.