Technical Stages :
- Add the white mushrooms and chervil and tarragon bunch to the .
- Dissolve the potato flour or cornstarch in a bowl with the white wine or Madera.
- Pour gradually the cornstarch on the boiling stock, whisking, to bind it as you want.
- Let boil and over moderate heat, frequently skimming, for an hour.
- Filter through a .
- Cool down quickly and keep refrigerated for 48 hours maximum.
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The essentials
To make this recipe, some of these items will be required: