Make the cake layers: Preheat the oven to 350°F (180°C) with an oven rack within the center. Spray 3 (8-inch/20cm) spherical cake pans with baking spray with flour. Line the bottom of the pans with parchment paper, and flippantly spray the paper.
Sift the flour, baking powder, and salt collectively right into a medium bowl. Whisk the buttermilk, melted butter, oil, vanilla, and coconut extract collectively in a big liquid measuring cup with a pour spout.
Within the steel bowl of a stand mixer (or in a medium heat-safe mixing bowl), whisk collectively the eggs and sugar collectively till nicely mixed. Set the bowl over a medium pot of barely simmering water (make sure that the bottom of the bowl isn’t touching the water). Warmth, whisking consistently, till the combination reads 105°F (40°C) on a thermometer.
Take away the bowl from the double boiler, and switch to the electrical mixer fitted with the whisk attachment. (Alternatively, in case you’re utilizing a hand mixer, whip in the identical bowl you heated the eggs in.) Beat the eggs on excessive velocity till pale and thick, 5 to six minutes. Scale back the velocity to medium and whisk for two to three minutes extra.
Sprinkle about one-quarter of the flour combination onto the egg combination, and blend on low velocity simply till included. Add the remaining flour combination in 2 to three additions, mixing simply till included into the batter.
With the mixer working on low velocity, regularly add the buttermilk combination to the bowl in a sluggish, regular stream. As soon as it’s all added, combine till the batter is evenly mixed. Fold within the coconut with a silicone spatula till included.
Divide the batter between the ready pans (about 550 grams per pan).
Bake till the middle springs again gently when touched, 35 to 40 minutes. Take away the truffles from the oven, and place the pans on a cooling rack. Allow them to cool within the pans for quarter-hour after which run a small offset spatula across the outdoors of the pan to loosen it. Invert the truffles onto the cooling rack, gently peel away the parchment, and permit to chill fully.
Make the custard filling: In a medium pot, whisk the coconut milk, cream, sugar, cornstarch, salt, and eggs till nicely mixed. Switch to the stovetop and prepare dinner over medium-low warmth, whisking consistently, till the combination begins to thicken, 2 to 4 minutes. It may be useful to change to a silicone spatula for higher stirring as soon as it begins to thicken.
Proceed to prepare dinner, stirring consistently, till the combination involves first boil (fats bubbles developing from the middle of the pot), 2 to three minutes extra. Take away the pot from the warmth, and stir within the butter, vanilla, and coconut till the butter is totally melted and every thing is evenly mixed.
Switch the combination to a medium heat-safe bowl, and canopy straight with plastic wrap. Cool to room temperature after which switch to the fridge till totally chilled, at the very least 2 hours. (To hurry up cooling, pour the custard onto a baking sheet, and canopy straight with plastic wrap. The elevated floor space will cool it down a lot quicker!)
Make the frosting: Within the bowl of an electrical mixer fitted with the whisk attachment, beat the butter on excessive velocity till almost white in shade, fluffy, and really aerated, 7 to eight minutes. Scrape the bowl nicely, add the vanilla and salt, and beat for 1 minute extra.
With the mixer working on medium velocity, regularly add the sweetened condensed milk in about 4 additions, pouring it into the mixer in a sluggish, regular stream. Scrape the bowl nicely a few times as you incorporate the condensed milk.
Proceed to beat the frosting on medium-high velocity till it’s thick and easy, 1 to 4 minutes extra. (If the frosting seems to be damaged or grainy at any level, maintain going. Elevate velocity to excessive and proceed to whip till it comes again collectively.)
Switch one-third of the frosting (about ¾ cup or 194 grams) right into a pastry bag and with a big spherical pastry tip (about ½ inch/1 cm extensive), or minimize a ½-inch/1cm opening from the tip.
Assemble the cake: Use a serrated knife to take away the domed prime of the truffles, if wanted. Use a dab of frosting to stick a cake layer to a cake board, platter, or cake stand. Pipe a hoop of frosting across the outdoors fringe of the cake layer. Scoop about one-third of the custard filling (about 1 cup or 300 grams) into the middle, and unfold it into a good layer.
Place one other cake layer on prime, and gently press down to stick. Repeat the piping and filling course of with one other cake layer. Place the ultimate cake layer on prime, and press down gently to stick.
Use a small quantity of frosting to use a skinny, allover crumb coat of frosting. Switch the cake to the fridge for 15 to twenty minutes to agency up.
Use the remaining frosting to frost the highest and sides of the chilled cake in a skinny layer of frosting throughout. Use the pastry bag to pipe a hoop of frosting across the periphery, and spoon the remaining custard filling into the middle of it, and unfold into a good layer.
Use your fingers to press coconut into the edges and the highest, overlaying all of the frosted parts of the cake (leaving the custard uncovered). Densely pack the coconut, urgent it firmly onto the cake.
Use a knife to softly divide the cake into 8 even slices. Simply barely mark the floor of the cake as a information. Use the remaining frosting within the pastry bag to pipe a rounded dollop within the middle of every slice, nearer to the periphery. Place a Raffaello sweet on prime of every dollop.
Refrigerate the cake till able to serve, however let it stand at room temperature for about half-hour to melt the frosting earlier than serving. Cowl and refrigerate for as much as 3 days.
