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Cookegg yolks in top of a double boiler over simmering water on medium heat, whipping constantly until tripled in volume.
2
Remove from heat and whip in butter, a little at a time, until all is used.
3
In a separate saucepan, combine vinegar, tarragon, shallots and peppercorns and cook until reduced by at least half.
4
Strain the reduction into the egg mixture, squeezing the tarragon to extract all the liquid. (There should only be a small amount, about 1 tablespoon). Stir until well blended. Place container in a pan of warm, not hot, water until serving time.