Oil baking tray (10x15 inch ; 25 x 38 cm) and line it with parchment paper. Oil parchment paper. Set aside.
To a small bowl add, flax seed and water. Mix well and let stand for 10-15 minutes.
To a large bowl, add sugar and water. Whisk until sugar is completely dissolved.
Then add oil and flax seed mix. Mix well.
Sift in flour, baking powder and cocoa powder.
Mix until dry flour is no longer visible. DO NOT OVER MIX (mix until dry and wet ingredients are just combined).
Transfer dough to baking tray and spread evenly.
Bake in preheated oven to 350oF (180oC), rack middle position, 10-13 minutes.
Oil a large piece of parchment paper. Then, turn cake onto parchment paper. Peel parchment paper from cake. (see video)
Trim all 4 edges of cake.
Spread cherry filling evenly on cake and roll cake.
Then, roll cake tightly in parchment paper. Chill for 1 hour.
Dust top of cake with cocoa powder.
Decorate top of cake with whipped coconut cream. Recipe for whipped coconut cream: https://shirleycooking.com/coconut-whipped-cream/