Preheat oven to 350 degrees. Halve radicchio heads down the middle. Cut out hard core and remove several layers of inner leaves to hollow out a small hole for stuffing. Chop up radicchio leaves and combine with goat cheese, pistachios, shallots, chervil and olive oil; season to taste with salt and black pepper. Fill radicchio halves with stuffing. Bake until hot and golden, about 30 minutes.
Yield: 4 servings