- 1. Melt the butter in a small pan.
- 2. Add the cornflour whilst continuously stirring.
- 3. Pour in the milk a little at a time beating vigorously until smooth after each addition.
- 4. Simmer gently for 2-3 mins until smooth and thickened stirring occasionally.
- 5. Add the parsley and sorrel if using and reheat gently until the sorrel has just wilted.
- 6. Season with white pepper to taste.