- 5 tablespoons [75 mL] wine vinegar
- 1 shallot or 1 small onion, quartered
- 1 sprig tarragon
- 1 sprig chervil
- 4 peppercorns
- 1/2 cup [100 g] butter
- 2 large egg yolks
- 1/8 teaspoon [0.5 mL] salt
- 1 teaspoon [5 mL] freshly chopped tarragon
- 1 teaspoon [5 mL] freshly chopped chervil
- 1/8 teaspoon [0.5 mL] Cayenne pepper [optional]
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- Pour wine vinegar into a small casserole; add shallot or onion pieces, tarragon sprig, chervil sprig and peppercorns.
- Simmer over low heat until vinegar is reduced to 1 tablespoon [15 mL].
- Strain and set aside.
- Into a small saucepan, beat butter until soft; reserve.
- Into a clean small saucepan, beat egg yolks, using a metal whip or a wooden spoon.
- Salt egg yolks.
- Beat well; pour in reserved 1 tablespoon [15 mL] vinegar.
- Pour into the upper part of a double boiler; transfer over warm water, over low heat.
- Slowly warm-up mixture, without boiling, stirring until thick.
- Slowly stir in reserved softened butter.
- When sauce is of whipped cream consistency, stir in freshly chopped tarragon and chervil and, if desired, Cayenne pepper.
- Check for seasonings.
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