Preheat your oven to 350°F (176°C). Cut a circle of parchment paper to fit the inside bottom of an 11” tart pan. Place the paper in the pan, and spray the inside rim with vegetable spray, or coat with vegetable oil. Set aside. 

Crust: Using an electric mixer, combine the crust ingredients until you have a mixture that resembles pebbles and sand. Press the mixture into your prepared tart pan, making sure to press the crust mixture up the sides of the pan.  

Filling: Make the filling by combining the mascarpone cheese, cane syrup and egg in a bowl. Using an electric mixer, whip until smooth, about 2-3 minutes. Spread the cheese mixture over the prepared crust in the pan, and smooth so that the filling is evenly spread. Arrange the sliced plums on top. Drizzle the melted butter over the pastry and use a pastry brush to gently extend the butter over the fruit.   Place the tart in the oven and bake for 1 hour.   Once the tart filling seems firm, remove the tart from the oven, and allow to cool completely.  

Glaze: Whisk together the glaze ingredients, and drizzle over the tart right before serving