Preheat the oven to gas 4, 180°C, fan 160°C. Roughly chop the rhubarb and add to a saucepan with the sugar, honey and a splash of water. Cook for about 15 minutes until softened. Pour the rhubarb into an ovenproof dish and sprinkle with the uncooked blueberries.
In a large mixing bowl, add the sugar, flour, oats and butter, then rub together to an even texture. Sprinkle the topping over the fruit, then finish with the flaked almonds. Oven cook for 30 minutes until golden brown.
Mix the vanilla extract with the crème fraîche and serve with the crumble.
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