Preheat the oven to 200°C
Place the stone fruit into a medium ovenproof dish. Drizzle evenly with the honey and gently toss to coat.
Roast for 30 minutes, or until the fruit is soft, juicy, and beginning to caramelise.
While the fruit is roasting, place the flour and cold butter in a mixing bowl. Rub together with your fingertips until the mixture resembles coarse breadcrumbs. Stir through the sunflower seeds, pepitas, flaked almonds, brown sugar, cinnamon, and nutmeg until well combined.
Remove the fruit from the oven and scatter the crumble topping evenly over the top. Return to the oven for 25–30 minutes, or until the topping is golden and crisp.
Serve warm with vanilla ice cream, custard, or thick cream.