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Preheat the oven: Preheat the oven to 180°C (350°F).
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Prepare the filling: Wash and quarter the fresh apricots (cut small apricots into 4 pieces, large ones into 8). Pit and halve the cherries. In a large bowl, mix the apricots and cherries with brown sugar, lemon juice, lemon zest, rosemary, a pinch of salt, and cornstarch. Toss everything together until the fruit is evenly coated. Transfer the mixture to a baking dish and set aside.
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Prepare the oat topping: In a large bowl, combine the oats, nuts, brown sugar, ground cinnamon, and a large pinch of salt. Cut the soft butter into cubes and add to the dry ingredients. Use your fingers to work the butter into the oats until small clumps of dough form. Evenly sprinkle the oat topping over the apricot-cherry mixture.
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Bake: Bake the crumble for 30-35 minutes, until the topping is golden brown and the filling is bubbling. I cover the crumble for the first 20 minutes to allow the fruit to soften while preventing the topping from browning too quickly. Then, I remove the foil and bake until the topping turns golden brown. Your crumble is ready when the topping is golden brown and crispy, and the fruit filling is bubbling underneath.
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Cool and serve: Let cool for about 10 minutes before serving.