Place a dill head (or fronds) into each sterilised jar. Add a teaspoon of dill and mustard seeds and a garlic clove to each jar. Put the vinegar, 200ml/7fl oz water and the sugar in a large saucepan.
Cover the salmon with the dill, and allow to stand in a cool ... Serve with thin slices of whole-grain bread and mustard sauce (recipe below). (The gravlax will keep in the refrigerator for ...