Scatter the walnuts on a baking sheet and toast in an oven preheated to 180°C/Gas Mark 4 for 5-7 minutes, giving them a shake halfway through, until just beginning to colour and develop aroma. Leave to cool, then chop very roughly.
To prepare the crumble, sift the flour and salt into a bowl (or food processor) Add the butter and rub in with your fingers (or pulse briefly in the processor) until the mixture resembles course crumbs. Stir in the sugar, oatmeal and ground almonds, if using. Squeeze a few handfuls of crumble in your fist to make lumps – I reckon it’s nice to have a ’rocky’ crumble than a fine, even-textured one.
Put the apples in a large bowl, sprinkle over the sugar (you’ll need to estimate the amount according to the tartness of the apples). Add the walnuts and the cinnamon, if using, and mix roughly. Spread in a pie dish or other ovenproof dish, getting the fruit as compact as you can.
Scatter the crumble over the apples in a fairly even layer and bake for 40-45 minutes, until browned on top. Serve hot, with cream, custard or ice cream. eat leftovers cold for breakfast, with thick, rich yoghurt.
100g walnuts
1.25kg cooking apples, peeled, cored and finely sliced
50-100g caster sugar
1 teaspoon ground cinnamon (optional)
For the crumble:
225g plain flour
A pinch of sea salt
200g cold unsalted butter, cut into cubes
150g caster, granulated or soft brown sugar
75g medium oatmeal
75g ground almonds (optional)
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