Smooth mayo is given a loving kick from zippy mustard for a sauce that's made to be squeezed over chicken, chips and inside sarnies. Colman's is to English mustard what Heinz is to ketchup ...

Serve with thin slices of whole-grain bread and mustard sauce (recipe below). (The gravlax will keep in the refrigerator for a week if well wrapped in foil and plastic, and in the freezer for two ...