Boil salted water in a pot.

Add sliced mushrooms to boiling water.

Reduce heat and simmer, covered, for 1 minute.

Drain the mushrooms and chill.

In a separate bowl, mix minced chives, whipping cream (or half-and-half), red wine vinegar, granulated sugar, salt, and pepper.

Pour the mixture over the chilled mushrooms and toss to combine.

Chill the salad for at least 1 hour before serving to allow flavors to meld.

Serve the salad in lettuce cups if desired.