
Bubbling blueberry filling peeking through a golden, coconut-flecked crust is one of those desserts that feels both rustic and a little special. The filling gets its glossy, jammy texture from arrowroot starch rather than cornstarch or flour, and a hit of lemon zest plus ground ginger keeps the sweetness bright and layered. The crumble topping leans on cassava flour, tapioca starch, and shredded coconut for that satisfying crunch ā no oats, no almond flour, and absolutely nothing derived from beans or legumes hiding in the mix. That matters more than you'd think, since plenty of store-bought crumbles and grain-free baking blends sneak in chickpea flour or other legume-based thickeners. Here, solid coconut oil is worked into the dry ingredients until the mixture forms those perfect pea-sized clumps that bake up crisp and golden. The whole thing comes together in one baking dish, and that ten-minute rest after it comes out of the oven is genuinely worth the wait ā the filling thickens into something scoopable and rich. Serve it warm on its own or with a dollop of coconut cream for a dessert that nobody at the table will believe is as fuss-free as it actually is.
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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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