Peel the watermelon (just the red part) and remove the seeds. 

Mash the watermelon pieces by hand in a large bowl. Add the flour and the sugar and mix. 

Oil the biggest tray of our oven and sprinkle with a bit of sesame and cinnamon.

Pour the watermelon mix into the baking tray.

Sprinkle the top with a bit of sesame, cinnamon and a little bit of oil. 

Bake at 180°C for about an hour until the surface is golden brown.