Ingredients 500 ml whole milk ½ onion, peeled and sliced 5 black peppercorns 1 bay leaf 2 fillets of natural smoked haddock, pin-boned and skin on (I recommend Alfred Enderby, from Grimsby, https://alfredenderby.co.uk/) 2 tbsp white wine vinegar 4 large free-range eggs Small bowl of water with ice cubes 40 g  butter 1 tbsp plain…