Bring mixture to a boil over medium heat, stirring non stop. Once it gets to a boil, lower heat to medium-low.
If you want to make the truffles to put on top of the cake, the coconut fudge truffles is pretty much the same recipe for the filling, without the coconut milk, and needs to be cooked about 5 minutes longer. You can find a recipe for it here.
Return the other saucepan with the remaining fudge to the stove, and cook for another 5 minutes or so, stirring non-stop, until very thick. Remove to a small bowl and place it in the fridge. When this mixture becomes cold, you can lightly butter your hands, spoon some of the fudge and roll it between your buttered hands, then roll it into some shredded coconut, and place it on mini paper cups. Keep the fudge truffles in the fridge for up to 1 week, or in the freezer for up to 2 months.
*Yogurt: Regular yogurt, or even vanilla will work as well
**Coconut milk: Make sure to use coconut milk, not coconut water, not coconut juice, not coconut cream. Coconut milk can usually be found in the Thai food aisle, or in the baking aisle, and it comes in a can. There is about 1 1/2 cups of coconut milk in a can, and you will only need one 13.5 oz. can for this entire recipe including the cake layers, the filling, and the frosting.
***Raspberry Jam: If you don’t want to make your own raspberry jam, use store bought, you’ll need about 1/4 cup to fill the cake.
****Cake size: As reported by readers, if you bake the batter in the 8" pans, the cakes will be quite thin. So I recommend doubling the recipe, by simply doubling each ingredient, and then using 3-8" pans to bake the cakes.