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Now I know why it's called a Daring Baker Challenge (this is my first one). I'm happy with the end product, but not proud. The gateau was too flat (and too great of crumb), the ganache was delicious but too rich, and the buttercream: Ew, and hard to work with, thanks to the hazelnut chunks clogging my tip.
First challenge: how do I remove the skin from the hazelnuts? Do I boil them a la Rose Levy Beranbaum and rub off the skins, or do I go the Baker's Illustrated route and toast them, then rub off the skins?
I tried both with the hazelnuts and they both had their own challenges, but I decided the messes created and time spent were about the same. The main difference I found was the boiling method left a more delicate flavor than the toast and peel method.
The toasting method took a long time, created hazelnut dust in my kitchen, and I didn't get all the skin off, but didn't weird me out with pink boiling water.
My other challenges: I want a new mixer bowl and I need a new food processor. I overbeat my whites so my 10" genoise was too flat for 3 layers (only 1 1/2" tall - but I cut it into three layers anyway. Daring!); my food processor decided to fall apart on me so my praline paste was a little chunky for my 112 tip (a little smaller than the 114 leaf called for in the recipe) and I spent the decorating time with a knife wedged up the tip trying to dislodge the chunks; and finally, when I "thunked" the ganache (a bittersweet/semisweet concoction), the whole cake slid along the whipped topping layer to create a lovely little ledge tiltitude.
Despite all this, my near and dear declared the project Delicious! and I was immediately able to foist the rest of the cake off on some unsuspecting neighbors.
Oh, and I would probably not sample the liquor three or four times before pouring the ganache glaze. But maybe I would. It was pretty good stuff.
Hazelnuts don't seem to be an exploited crop, although I couldn't find much on them. Flour is usually an issue, but King Arthur flour is worker-owned. The butter is organic, and the eggs local but I used cane sugar -- a HUGE environmental yuckola. Can't wait for the next challenge ...