This iteration of the classic French sauce was made with swordfish in mind, but will work for most seafood, and light poultry as well. It can be used as a lower cholesterol substitute for Hollandaise sauce also. The sauce is pretty simple. The trickiest part is mounting the sauce with butter and not breaking the sauce. This is easily avoided by simply paying attention and pulling the pan from the heat while adding (mounting) the butter, returning it to the heat if the pan cools too much.