In a large bowl combine the flour, milk, lemon juice and oil.  Cover with a towel or plate and let sit for 7-24 hours.

Grease a 7x11 baking dish.  Heat the oven to 350*F.

In a medium bowl combine the fruit, cinnamon, 2 Tbsp. sugar and 2 Tbsp. tapioca flour.  Pour into the prepared pan.

Bake the fruit for 10 minutes while you prepare the topping.

Add the egg, 1/4 cup sugar, baking soda and salt to the soaked flour.  Beat well until combined and any lumps are removed.

Remove the pan from the oven and spread the cake batter on top.  Return the pan to the oven.

Bake for 35 minutes.

Allow the cake to cool for at least 20 minutes before serving so the fruit mixture can thicken.