This sauce is better known among chefs as beurre blanc. It is a very simple and very buttery sauce that works with many dishes, whether they’re fish, meat or vegetarian. The basic ingredients are, normally, white-wine vinegar, water, chopped shallots and butter. I have added a few more ingredients to this recipe to add a lot more flavour. I have also given four ‘stocks’ as alternatives, starting with water and running through fish, chicken and vegetar