In the bowl of a food processor fitted with a sharp blade, process the vinegar, mustard, honey, shallots, salt and pepper until the shallots are finely chopped. With the processor running, add the oil in a small stream until all the oil has been incorporated and the dressing has achieved a silky, smooth texture. The dressing may be stored, covered, for up to one week in the refrigerator, but should be brought to room temperature before using.;