Preheat oven to 450. Slice the radishes, toss them in olive oil, salt, pepper, and thyme, and distribute them upon an oiled baking sheet. Roast them for 15 to 20 minutes, giving them a stir about every five. They are done when they are tender, but still firm in the center. You can drizzle them with lemon juice or balsamic vinegar, or any of your other favorites. You can have them as a size or mix them into another dish. You could also try roasting them with meat, just like you would a potato or carrot. Celebrate the last of the winter radishes in preparation for the spring ones.