This is a delicous sauce that goes fantastic with any white meat, poultry or fish. It is a sauce that I first tasted in Nutter's restaurant (UK) served with pork. I bought his cook book which included the recipe and have made it myself countless times since. It is a family favourite and we all love it and use so much of it that this recipe designed to serve 4 actually only serves 3 of us!! A tip is to serve the sauce with a ladle or spoon instead of just pouring it so that you get plenty of the onion, otherwise the sauce tends to coem out and the onion stays in the bottom of the jug!