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1. Add unsalted butter to stockpot. Heat over medium heat.
2. Sauté leeks and onion in butter for 10 minutes, stirring frequently.
3. Stir in mushrooms. Sauté 5 minutes.
4. Reduce heat to low.
5. Stir in flour. Stir continuously for 3 minutes until mixture is thick.
6. Stir in chicken stock. Stir in 2-tablespoons dry sherry.
7. Bring soup to a boil over medium-high heat.
8. Reduce heat to low. Simmer 10 minutes.
9. Stir in half and half. Simmer 10 minutes, stirring frequently.
10. Season with cayenne pepper and white pepper.
11. Stir remaining 2-tablespoons sherry into soup.
12. Serve hot.
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