Salmon Mousse

Basic food products—flour, sugar, yeast, etc.—sometimes contain quite good recipes on or in them. Some are ill-advised brainstorms of an ad agency, but most are created by food professionals hired to promote one product. The Knox gelatine people try to tout their product for everything from strengthening fingernails to steadying a mousse. Upon request, the company will send out acres of recipes using gelatine, and I have found all of them reliable, if somewhat square. This salmon mousse is