Chocolate mousse cheesecake

Name: Chocolate mousse cheesecake
Cuisine: European, Mediterranean, French
Ingredients: ¼ cup pecans; 1½ cup chocolate crumbs; 2 tbsp sugar; ⅓ cup melted butter; 2 packages cream cheese, room temperature; ½ cup sugar; 1 tsp lemon juice; 1 tsp vanilla; 2 whole eggs; 1 cup semi sweet chocolate chips; ¼ cup butter; 3 egg yolks; ¼ cup sugar; 2 tbsp strong coffee; ½ cup heavy cream - whipped