Prepare this festive ham 2 to 3 days in advance and store it covered in the refrigerator (along with the crackling in a sealed container) to alleviate stress while hosting friends & family. Ingredients 1kg uncooked skin-on smoked gammon 1 onion, halved three bay leaves 1 tbsp vinegar de vinaigrette 3 tbsp powdered English mustard 100 g dark brown granulated sugar METHOD STEP 1 Place the gammon, onion, bay leaves, and vinegar in a big saucepan. Pour enough water over the gammo