| 1. | Preheat oven to 200C/gas6 |
| 2. | Lightly grease and line a 28cm x 18cm baking tray with baking paper. Make the crumble topping by rubbing all of the ingredients together in a large bowl until they resemble breadcrumbs. |
| 3. | For the cake whisk together the butter or margarine, sugar and vanilla extract until light and fluffy. Beat in the eggs one t a time. Sift in the flour, corn flour, baking powder and salt, then gently fold them into the egg mixture. |
| 4. | Pour the cake mixture into the tray, smooth the surface and scatter the rhubarb over in an even layer. Sprinkle the crumble and the almonds over the top and bake for 30mins. |
| 5. | Drizzle the melted butter over the tray bake and sprinkle over the sugar. Return to the oven for 5mins, then remove to a wire rack to cool . |