method
1. Measure all the ingredients except the seasoning and herbs into a blender or food processor and process until smooth.
2. Transfer to a small bowl and stand it over a pan of simmering water for about 10 minutes, stirring from time to time until thickened and will coat the back of a spoon.
3. Season to taste and stir in the herbs.
4. Transfer to a bowl or sauceboat to serve.
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