Mustard dressing is one of my favourites,so easy,and egg-free for those with allergies. Try it on anything you would use mustard for,such as smoked trout,grilled rib eye or juicy pork snags. It is lovely on potato salad with crunchy vegetables,which makes a perfect side dish for this rich confit duck. Drizzle extra dressing over the duck just before serving for added kick.