Into a bowl, add the eggs, the sugar, the butter and mix well until combined.
Add the coconut milk and the grated cassava (set some cassava aside), mix it all together very well.
Grease a cake pan with butter and pour the mixture. Top it with the grated cassava we've set aside.
Bake in a preheated oven at 180°C (356°F) for 45 to 55 minutes, or until golden. Serve.