Preheat oven to 180°C and spray a removable bottom cake tin with oil.
Arrange plums in tin, packing tightly in a circular pattern, covering the whole base. Sprinkle with 1 tablespoon of Norbu.
Beat 1/4 cup Norbu and eggs together for a few minutes, add milk and vanilla and continue to beat for another minute.
Add flour and salt, blend until combined, pour over plums and bake for 20 minutes.
Combine remaining crumble ingredients in a clean bowl, scatter over cake and bake for another 20-25 minutes, or until an inserted toothpick comes out clean.
Cool in tin for 10 minutes before serving.
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