Recipe credit to Food52: https://food52.com/blog/7905-blueberry-schlumpf
Preheat the oven to 350F.
Make the topping - combine the flour, butter and brown sugar in a bowl. Using your fingers, blend the butter into the flour/sugar mix until it's all sort of crumbly. Put the bowl in the fridge while you mix the filling.
Stir together all of the filling ingredients. Spread the filling onto a baking sheet. (The baking sheet gives you a thinner, wider spread so that you get lots of crispy, tasty topping) Sprinkle on the topping, followed by the coconut.
Bake for approximately 30 minutes, until bubbling and golden brown on top.
If you are baking this ahead and are ready to eat, put your oven on broil and re-heat for only about 2-3 minutes to get the top nice and crispy again.