2Melt the butter or margarine in a stockpot over medium high heat. Add leek, onion, and carrot; cook, stirring occasionally, for 10 minutes. Stir in the tarragon and thyme; cook 1 minute longer. Add flour; cook, stirring constantly, for 1 minute. Reduce the heat to medium, and gradually stir in the wine and chicken stock. Season the soup with salt and white pepper. Add the steamed cauliflower flowerets. Simmer the soup, uncovered, stirring occasionally for 30 minutes.
3Puree the soup in batches in a blender, and return to the pot. Stir in the milk and cream. Gently heat just until heated through.
4If you decide to use the Swiss cheese, stir it in and heat until melted.
Footnotes
Tip
Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.