Peel and core the apples, and cut them into about 1cm cubes.
Place the apple cubes into a medium-sized ovenproof pie dish and stir through the lemon juice.
Stir in the plain flour and brown sugar, and coat the apple well. Pour the water over.
Now make the topping by rubbing the cubed butter into the plain flour, brown sugar, oats, mixed spice and cinnamon until a little clumpy and thoroughly mixed (see notes).
Scatter the topping mixture over the filling and bake for 30-35 minutes at 180℃/350F fan, 200℃/400F or Gas Mark 6 until golden and crunchy.
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