Preheat the oven to 180 degrees C for about 10 minutes.
In a mixing bowl, whisk together oil, eggs, sugar and vanilla sugar till the sugar dissolves completely.
Add refined flour, baking soda, baking powder, cinnamon powder, nutmeg powder and grated pumpkin. Mix using a spatula.
Add grated coconut. Mix well.
If the batter looks too thick, add milk.
Transfer this batter to a greased and dusted baking mould. Tap a couple of times so that the air gaps are removed.
Bake for about 50-60 minutes or till a toothpick, when inserted, comes out clean.
Remove from the oven and let it cool for about 10 minutes. Then transfer it to a wire rack to cool completely. Then cut it into slices.