½ cup vermouth
½ cup chicken stock
2 tbsp lemon juice, strained
4 oz (1 stick) chilled butter, cut into 8 pieces
¾ cup heavy cream, whipped
3 tbsp chopped chives or parsley
Boil the vermouth, chicken stock and lemon juice in a small non-reactive saucepan until reduced to about 2 tablespoons.
Remove from the heat and beat in two pieces of chilled butter.
Set over a very low heat and beat in the rest of the butter, a piece at a time.
Remove from the heat and stir in the whipped cream and chopped herbs.