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Cook the apples with the caster sugar in a large pan, stirring occasionally – add a splash of water if they start to stick on the bottom. When just about tender and a bit saucy, stir in the sultanas or raisins and tip into 2 large ovenproof dishes.
Melt the brown sugar, honey and butter together in a large pan. Off the heat, stir in the oats, flour, almonds and cinnamon until sticky and crumbly. Divide over the apples. To bake straight away, heat oven to 180C/160C fan/gas 4 then bake for 40-50 mins until topping is golden and crisp. To freeze, wrap dishes well or freeze the fruit and crumble mixture in separate freezer bags if you don’t have spare baking dishes. To cook from frozen, cover with foil and bake at 180C/160C fan/gas 4 for 1½ hrs, then turn the oven up to 220C/200C fan/gas 8 and bake for a further 45 mins, removing the foil for the last 15 mins.