Grown-up dessert! A layer of dark chocolate topped with sweet, rich pecan filling. This pie has a buttery, shattery crust and a strong hit of chocolate, so use the best you can find. I had a big bar of bittersweet Sharfenberger that worked beautifully.
The recipe is wonderful as is, but I have a few tips.
When making the crust, use 1/2 to 1 tbsp of vodka if the dough needs moistening after the initial 3 tbsp of water. This is a Cook's Illustrated tip that keeps the dough from getting too tough while making it easier to roll out.
Because you're putting a layer of chocolate on the bottom, the pie is best served a little warm. If you eat it straight from the refrigerator, you've got a hard piece of chocolate to bite through (not the most appealing).
As always, I also suggest making your own brown sugar. Just mash together regular sugar and molasses with a fork until it turns the desired shade of brown (whether you're looking for light or dark brown sugar). The taste is always much richer than conventional brown sugar.
Here's the recipe, from Gourmet: Chocolate Pecan Pie.