Classic crumble mix and four filling ideas

Method

1. In a large bowl, rub the butter together with caster sugar, demerara sugar and self-raising flour, until like coarse breadcrumbs. Freeze or use as a topping for any of the following fruit fillings.
2. For the apple and berry filling: mix the bag of frozen summer or forest fruits with the apple and caster sugar in a 1.2-litre ovenproof dish and top with the crumble mix.
3. For the classic apple filling: mix the cooking apples with the cloves, cinnamon, ginger and caster sugar in a 1.2-litre ovenproof dish and top with the crumble mix.
4. For the pear and stem ginger filling: mix the pears with the stem ginger, the syrup and caster sugar in a 1.2-litre ovenproof dish and top with the crumble mix.
5. For the plum and almond filling: mix the mixed plums with the caster sugar and almond essence in a 1.2-litre ovenproof dish and top with the crumble mix.
6. Bake the crumbles at 200°C/fan180°C/gas 6 for 40 minutes, until golden.