1. Preheat oven to 400ºF. Mix sugar and pineapple in a 9-inch pie plate.
2. Combine oats, coconut, brown sugar, flour and ginger in a bowl. Add butter and pinch with your fingers until well combined and mixture is crumbly. Scatter topping over pineapple. Bake until fruit is bubbling and topping is golden, 35 to 40 minutes. Let cool on a wire rack. Serve warm.