Preheat the oven to 450°F. Slice the radishes in half and place them in a roasting dish (or on a baking sheet with parchment paper). Toss with drizzles of olive oil and pinches of salt and pepper and place cut-side down.
Roast 10 to 15 minutes or until they reach your desired doneness. I like my radishes to have a bit of a crunchy bite. If you prefer softer radishes, roast them longer.
Serve with squeezes of lemon and season to taste. These are also wonderful with dollops of radish green pesto or tossed into this radish salad.