
Juicy blueberries bubbling beneath a golden, coconut-kissed crumble is the kind of dessert that makes a whole kitchen smell incredible. The filling comes together with bright lemon zest, a touch of maple syrup, and warm Ceylon cinnamon and ginger, while arrowroot starch pulls everything into a glossy, jammy sauce as it bakes. The topping uses cassava flour, tapioca starch, and shredded coconut worked together with solid coconut oil until it forms those perfect coarse, clumpy crumbs that crisp up beautifully in the oven. Every single ingredient here is naturally free from chestnuts, so there's no need to scrutinize labels or worry about sneaky nut-based thickeners that sometimes show up in store-bought crumble mixes. The whole thing bakes at 375°F until the edges are bubbling and the topping turns a deep, satisfying gold — and that ten-minute rest before serving is genuinely worth the wait, since the filling thickens into something scoopable and luscious. Serve it warm on its own or with a generous spoonful of your favorite coconut cream for a dessert that feels indulgent without any compromise.
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Preheat the oven to 375°F (190°C). Lightly grease a 9-inch baking dish with a small amount of coconut oil.
In a large mixing bowl, combine the blueberries, arrowroot starch, 2 tbsp maple syrup, lemon zest, lemon juice, ginger, 1/4 tsp Ceylon cinnamon, and 1/8 tsp salt. Toss until the berries are evenly coated and no dry starch is visible. Transfer to the prepared baking dish and spread into an even layer.
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