I ended up throwing this in the garbage after it sat on the counter for a few days with no one really wanting to eat at it. The kids didn't think it was chocolatey enough to have "chocolate" in the title or do eat that as their one allotted dessert item of the day. I nibbled on it here and there but wasn't wowed by it so eventually stopped too. Was it because I used a 13"x4" pan instead of a 13.75" x 4.5" pan? Maybe. My pan doesn't seem THAT far off from the original to have made everything sink but how can I know for sure until I try it again with the correct size pan? So I'm now seeking the larger tart pan if anyone out there has one that they'd like to lend me for the cause.
It's so sad when good ingredients don't turn out as hoped. But I won't be down for long as I have some almond frangipane in the refrigerator and a batch of the pâté sucree (also from La Tartine Gourmande) in there too that I made this afternoon with which I will make a different nectarine dessert. Tomorrow is another day and it's going to be a delicious one!