My idea for the stump de Noël cake came indirectly. I saw pictures of beautiful traditional bûche de Noël that were decorated with meringue mushrooms but a bûche would not be large enough to feed the number of people expected at the Christmas party so the cake metamorphosed into a larger stump which required more and more elaborate mushrooms. They are all made very simply from French meringue; field mushrooms with dark chocolate gills, bracket fungi from half moons of meringue dusted with cocoa powder and fly agarics decorated with the quintessential toadstool red cap with white spots.
I felt I had to try and make the fly acargic toadstools; the myth from the far icy North of reindeer flying apparently comes the eating of fly agarics which are supposedly hallucinogenic. I don’t recommend trying them; all our mushroom collecting books suggest they are nasty poisonous. The fly agarics were the hardest to make because white chocolate is a nightmare to work with. Three times I melted white chocolate and added red gel paste and three times the chocolate seized. I read all the tricks I could; I added it before melting the chocolate, I added it to some melted chocolate and then added it to the rest. I tried freeze dried raspberry dust moistened with water instead but that wasn’t red enough. In a fit of desperation I read somewhere in blogland that adding a little water to chocolate is a disaster (it seizes) but if you add alot then something miraculous happens. And it did. I added about equal volume of hot (almost boiling) water to a lump of seized white chocolate which I had coloured red, beat it vigorously with a wooden spoon and lo and behold, liquid red chocolate! I used this to dip half the cooked meringue tops (I did it twice, repeating the process when the first layer was set in order to get a good strong red colour). Once set, I added white dots in melted white chocolate. I think next time I make them, I will try colouring the meringue for the tops red so there is no messing around with finicky white chocolate.