not quite what I think of as "pastry" but kat and I have made this several times and it always comes out great. It's basically tofu and chocolate in an oreo crumb crust. Make sure you look at the ingredients on the crust to make sure it's vegan. Most of the store bought ones.
Moo-less chocolate pie
http://www.foodnetwork.com/food/recipes/recipe/0,,FOOD_9936_14312,00.html