900g/2lb onions, thinly sliced
2 tbsp grenadine syrup or crème de cassis
salt and freshly ground black pepper
75ml/3fl oz sherry vinegar or red wine vinegar
2 tbsp granulated sugar
oatcakes
110g/4oz butter
mature cheddar
blue cheese
grainy bread
Β½ bottle red wine, or less (to taste)