Melt chocolate au bain marie. Mix flour with 2 tbsp water and add to molten chocolate; stir thoroughly on low heat until mixture starts to thicken. Cool rapidly in a cold water bath while stirring occasionally. Add rum.

Whisk egg whites with sugar until stiff. Fold in chocolate mixture. Put in coupes and allow to set in refrigerator (min. 2 hrs).

Clean kiwifruit and slice thinly. Serve mousse decorated with kiwifruit slices.