In a heavy skillet cook garlic and rosemary in 2 tablespoons oil over moderate heat, stirring, 30 seconds. Add mushrooms with salt and pepper to taste and cook, stirring, until tender, about 5 minutes. Stir in 1 tablespoon vinegar and remove skillet from heat. In a large bowl toss chicory, endive, and radicchio with warm mushroom mixture. To skillet add 1 tablespoon vinegar, remaining 2 tablespoons oil, and salt and pepper to taste and heat through, stirring. Add hot dressing to salad and toss well. Add additional vinegar if using. Serves 4. Gourmet January 1995