First of all make sure that your Carrots are grated. You will need a good amount of 600 grams to make the cake. Once they are all grated, keep aside. Scrape 150 grams fresh Coconut or use packed one and keep aside as well.
Grab a huge Mixing bowl and add the Flour, Baking Powder, Brown Sugar, Cinnamon Powder and Salt. (The Brown Sugar we get here is super dark, the one I am used to in Europe is much lighter in color, which is better for the cake color, that is why the cake appears to contain chocolate in the picture ^.^). Mix the whole content!
Now, make a well into the center of the flour sugar mixture and break in the eggs and pour in the oil and rum.. Mix well!
Continue with the scraped Coconut, add it and mix it smooth.
The same with the grated Carrots. Add it all and carefully mix it all well to a smooth Cake mixture.
Now Preheat the oven for 5 minutes at 350° Fahrenheit/ 180° Celsius.
Grab a big round Cake mold, grease it and dust it with flour a bit. That will help the cake to come out smoothly without breaking, once finished baked. Pour the whole cake mixture into the mold.
Bake the Cake at 350° Fahrenheit/ 180° Celsius.. for about 50 - 55 minutes. Once you feel it should be finished baked, grab a knife and poke into the center to check if the cake is finished and well baked. If anything is left on the knife, it will need a couple of more minutes to get ready in the oven.
Once it has cooled after baking, take the cake out carefully so that it doesn't break.
In a cool bowl add the Whipping Cream and the Sugar and beat it well until stiff. Don't over beat it or it will kind of "break". (I did that once in college and it was a mess, had to start from scratch). just do it with the hand, doesn't take more then 2-3 minutes!
Spread the Frosting evenly onto the cake surface and even on the sides. That's pretty fun because nothing ever falls off and you should be done in a minute or two. ;)
Ready to be served!
Notes
I keep the finished cake in a cool place after adding the frosting, since I am living in a moist tropical climate and the cream gets bad very quickly.