Wild Mushrooms Vinaigrette

One of the several hundred types of wild mushrooms which grow in the Valley of La Grande Chartreuse is colored bright orange and known in English as the Lactaire Blood Root because when it is cut it oozes reddish juice. It is in fact delicious, but of course entirely unavailable in the United States. Mademoiselle Ray’s method of preparing them as a slightly tart hors d’oeuvre, however, works almost equally well with our American button mushrooms. This method of boiling and marinating all ki