Chocolate and Banana Tart

Name: Chocolate and Banana Tart
Ingredients: 4 tablespoons butter, room temperature; 1/4 cup sugar (for dough); 1 egg yolk (for dough); 3/4 cup all-purpose flour; 2 tablespoons cocoa powder; 2 ripe bananas, chopped; 1/4 cup light brown sugar; 1 cinnamon stick; 1/2 cup milk; 1 tablespoon sugar (for pastry cream); 1 tablespoon corn starch; 1 egg yolk (for pastry cream); 1 teaspoon vanilla extract; 1 tablespoon butter (for pastry cream); 2 ounces milk or semi-sweet chocolate chopped; 1/3 cup heavy cream; 1 tablespoon light corn syrup or honey