For the crumble:
1. Preheat the oven to 360F (180C).
2. Slice the plums. Place in a large bowl, add white sugar, cornstarch, lemon zest and mix well, until combined. Transfer to a 9-inch (23cm) baking dish.
3. In a large bowl place the ingredients of the crumble and rub with fingertips until the mixture resembles crumbs.
4. Sprinkle the crumble mixture over the plum mixture. Bake for 30-45 minutes, or until the topping is golden-brown.
5. Cool slightly. Serve with ice cream.
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