In a medium bowl make the vinaigrette by whisking together all the ingredients except the oil. While constantly whisking, drizzle in some of the oil, stopping to taste occasionally. Season to taste with salt and pepper.
Can be made in advance and stored in the refrigerator.
Bring to room temperature before serving.
For a creamier dressing add 1 Tb. mayonnaise
Core and chop apples (thin slices or 1 inch chunks). Toss lettuce, apples, walnuts, feta, and cranberries together in a large bowl. Add a little dressing and toss, taste for seasoning and adjust.
*If conventional apples are used, peel first.