Instructions: Preparing the Fruit Filling: In a bowl, combine the mixed fresh fruit, granulated sugar, lemon juice, and cornstarch. Toss gently to coat the fruit evenly. Set aside.
Making the Pie Crust: Bake the pie crust in the preheated oven for about 10 minutes, or until lightly golden. Remove from the oven and set aside to cool.
Making the Cake Crumble: Add the cold water and vanilla extract to the crumb mixture, and mix until it forms a dough. It should be slightly crumbly but hold together when pressed.
Assembling the Pie Cake: Crumble the cake crumb mixture over the fruit filling, covering it completely.
5. Baking: Bake the mixed fruit pie cake in the preheated oven for 30-35 minutes, or until the top is golden brown and the fruit filling is bubbling.
Serving: Serve with whipped cream or a scoop of vanilla ice cream for an extra treat.