In a medium bowl, combine shallot and vinegar. Let mixture stand for about 15 minutes.
Add mayonnaise, buttermilk, and honey, whisking to combine. Stir in thyme, salt, and pepper. Whisking constantly, gradually add olive oil, and mix until smooth and creamy. Chill for at least 1 hour. Vinaigrette can be stored, refrigerated, in an airtight container for up to 3 days.
Recipe by Victoria at https://victoriamag.com/stacked-waldorf-salad-with-creamy-apple-cider-vinaigrette-recipe/