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- Heat butter in a saucepan until it melts. Add onion and sauté until soft. Add flour and stir briskly for 10 20 seconds. Pour in water and add seasoning. Bring to a quick boil. Add chicken and reduce the heat. Simmer over a medium low heat for 15 20 minutes.
- Stir in cream and add the rosemary. Bring the saucepan away from the heat, then dish out to serve immediately.