Combine the cherries and white sugar in a square baking dish. Allow to sit for 15 minutes and then add in the starch and mixed to combine.
In a mixing bowl, combine the brown sugar and flour. Add the butter. Using your hands rub the butter into the sugar/flour mix until it's the texture of cornmeal.
Evenly distribute the topping on the cherries. Sprinkle on some turbinado sugar on top (optional)
Bake in the oven for 30 to 40 minutes or until the topping has browned and the fruit is thicken. It needs to reach 200 degrees when checked with an instant read thermometer. Allow to cool until the fruit sets up before serving. Can be served warm, cold, or at room temperature.