This rich, tangy French sauce is traditionally made with petit-suisse cheese, but cream cheese is a good substitute. Serve well chilled.
Process in a food processor until smooth and creamy:
With the machine running, add in a slow, steady stream:
Add in a slow, steady stream:
Blend in:
Stop the machine and scrape down the sides. Taste and adjust the seasonings. Transfer to a bowl, cover, and chill. The sauce will keep, covered and refrigerated, for 2 weeks.
Stir in before serving, if desired: