BEARNAISE SAUCE
from Craig Claiborne's "The N.Y. Times Cook Book"
  
1 teaspoon chopped shallots                        5 egg yolks
1 small sprig  tarragon, chopped                    3/4 cup butter, melted
1 small sprig chervil, chopped                          1 teaspoon minced chervil and tarragon                     
2 peppercorns
pinch of salt
1/4 cup tarragon vinegar
 
Simmer the shallots, tarragon, chervil, peppercorns and salt in the vinegar over low heat until the vinegar has been reduced by 2/3.  Cool to lukewarm.
Add the egg yolks and beat briskly with a wire wisk.  Place over low heat and gradually add the butter.  Whisk until the sauce thickens.  Strain--  (I never do).  Season with cayenne and stir in the minced tarragon and chervil.
 
This recipe makes 1 1/2 cups--you may want to halve it.