Hollandaise sauce

Serves 4-6, depending on what it is to be served with.

Hollandaise is the mother of all the warm emulsion sauces. The version we use here is easy to make and quite delicious with fish. Like mayonnaise, it takes less than five minutes to make and transforms any fish into a feast.

Once the sauce is made it must be kept warm: the temperature should not go above 70-80C/180F or the sauce will curdle.