In a medium bowl, combine the apple cider vinegar, Dijon mustard, honey, salt, and black pepper. If using, add minced shallot or garlic.
Whisk these ingredients together until the mustard and honey are fully incorporated.
While continuously whisking, slowly drizzle the olive oil into the vinegar mixture in a thin, steady stream to create an emulsion.
Continue whisking until the dressing appears slightly thickened and uniform in consistency.
Taste and adjust seasoning as needed with additional salt, pepper, honey, or vinegar.
If using fresh herbs, stir them in now.
Serve immediately over your favorite salad, or transfer to a sealed container for storage.