In a medium bowl, cream together the butter and sugar, until fluffy. Stir in the salt and vanilla. Add the egg, beat until well blended. In a small bowl, combine the flour and baking soda. Stir with a whisk. Add flour mixture to butter mixture 1 Tbs at a time. Toss with a fork until a soft dough forms. Gently knead the dough until it sticks together in a ball.
Shape the dough into a disk. Wrap in plastic wrap. Refrigerate for 1 hour.
Preheat the oven to 350ºF degree. Grease and flour an 8-inch springform pan. Place wax paper in the bottom. Press the dough out into the bottom of the pan, press up the sides of the pan about half way.
Make the filling
In a medium bowl, cream together the cheese and butter. Beat in the sugar, salt, orange extract, and orange zest. Beat in the flour until well blended. Spread the mixture into the bottom of the crust. Bake for 25 minutes. Set pan on a wire rack to cool. Remove the tart from the pan.
Make the ganache
Place the cream and corn syrup in a small saucepan. Heat over low heat until cream begins to simmer. Remove from heat. Add the chocolate, stir until the chocolate is completely melted. Let the ganache cool. Pour it over the filling, used a silicone spatula to spread the ganache evenly over the tart. Refrigerate for 1 hour before serving.