Swedish pickled herring
By Donal Skehan From Saturday Kitchen Ingredients 500ml/18fl oz white wine vinegar 200g/7oz caster sugar 2 bay leaves 1 carrot, peeled and roughly chopped 1 onion, thinly sliced 2 tsp whole black peppercorns 1 tsp yellow mustard seeds 10 salted herring fillets (about 1.3kg/3lb) rinsed, soaked …