Heat the oven to 200C/180C fan/gas 6. Toss the berries in a large heatproof dish with the jam, vanilla, lemon and sugar. Roast in the oven for 10 mins, or until the berries are soft but holding their shape. Mix a few tablespoons of the juices into the cornflour in a small dish, then add the cornflour mixture to the berries, combining well.

In a large bowl, combine the granola topping ingredients with a good pinch of salt. Squeeze the mixture in your hands to create some clumps. Scatter the mixture over the berries and return to the oven for another 20 mins, until crisp and golden. Serve with thick Greek yogurt or labneh.