How to make a mango-chocolate-coconut cake with a lemon glaze.
Ingredients
For the vanilla genoise:
3 large eggs
3 large egg yolks
1 teaspoon (4g) vanilla extract
pinch of salt
¾ cup (150g) of sugar
½ cup (70g) cake flour
¼ cup (30g) cornstarch
For the coconut Bavarian cream:
1 tablespoon (7g) powdered gelatin
3 tablespoons water
4 egg yolks
¼ cup (50g) sugar
1 cup (250ml) coconut milk
1 cup (250ml) heavy cream, cold
For the mango mousse:
1.5 teaspoons (3.5g) powdered gelatin
1 tablespoon (15g) water
4 oz (120g) mango puree (to make your own, see here)
2 tablespoons (25g) sugar
½ cup (125ml) heavy cream, cold
For the rum simple syrup:
½ cup (125ml)water
¼ cup (50gr) sugar
2 tablespoons (30g) rum
For the lemon glaze:
1.5 teaspoons (3.5g) powdered gelatin
1 tablespoon (15g)water
¼ cup (62.5ml) water
¼ cup (62.5ml) lemon juice
2 tablespoons (25g) sugar
Method
Prepare the vanilla genoise:
Preheat the oven to 400F and set a rack in the middle. Lightly spray a 12x17 baking sheet with cooking spray or lightly brush with melted butter. Set aside Whisk the eggs, egg yolks, vanilla, salt and sugar together in a large bowl over a pan of simmering water. Whisk gently until the mixture is just lukewarm, about 100F on a candy thermometer(or test with your finger - it should be warm to the touch). Transfer the mixture to the bowl of a stand mixer fitter with the whisk attachment (or hand held beaters) and whip on medium-high speed until the egg mixture is cooled and tripled in volume. The mixture will be thick and will form a slowly dissolving ribbon falling back onto the bowl when the whisk is lifted. Over a medium bowl or a piece of parchment paper, sift together the flour and cornstarch. Add one-third of the flour mixture to the beaten egg mixture. Use a rubber spatula to fold in the flour mixture, making sure to scrape all the way to the bottom of the bowl to prevent the flour mixture from making lumps. Repeat with another third of the flour mixture and finally with the remainder. Pour the batter into the prepared pan and smooth the top with an offset spatula. Bake the genoise for about 10 to 12 minutes. Make sure the cake does not over bake and become too dry or it will not roll properly. Let cool on a rack. Remove the cake from the baking sheet and invert it on a larger piece of parchment paper. Peel of the parchment paper that was lining the baking sheet. Set the cake aside.
For the cocoa genoise:
Same process but replace the amount of cornstarch with the same amount in cocoa powder and proceed with the recipe the same way.
Prepare the coconut Bavarian cream:
In a small bowl, sprinkle the gelatin over the water and let stand to soften while you prepare the cream. In a large bowl, whisk the egg yolks with the sugar until very pale. In the meantime, in a medium large saucepan set over medium heat, bring the coconut milk to a simmer. Slowly pour the milk over the yolks, whisking constantly to prevent them from curdling. Pour the mixture back into the saucepan over medium low heat and cook until the cream coats the back of a spoon (as if making creme anglaise). Add the softened gelatin and stir until melted completely into the cream. Let cool to room temperature. In a stand mixer fitted with the whisk attachment, whip the cream to soft peaks on medium speed and fold it into the cooled cream base. Use within one hour.
Prepare the mango mousse:
In a small bowl, sprinkle the gelatin over the water and let it soften while you prepare the fruit. In a medium saucepan, bring the mango puree and sugar to a simmer. Remove from the heat and add the softened gelatin. Stir until the gelatin is completely melted. Transfer the fruit puree to a large bowl and let it cool to room temperature. In a stand mixer fitted with the whisk attachment, whip the cream on medium speed until soft peaks form. Fold about ⅓ of the whipped cream into the fruit puree to lighten it up (do not worry about losing air at this point). Carefully fold in the rest of the whipped cream. Use within one hour.
Prepare the rum simple syrup:
In a small saucepan set over medium high heat, bring all the ingredients to a simmer until the sugar dissolves, stirring occasionally. Let cool to room temperature.
Prepare the lemon glaze:
In a small bowl, sprinkle the gelatin over the water and let it soften. In small saucepan set over medium high heat, bring the water, lemon juice and sugar to a simmer, stirring off and on to make sure the sugar dissolves properly. Add the gelatin and stir until completely dissolved. Let cool to room temperature (if the mixture gels, warm up over low heat until barely melted again).
Assembly:
Line an 8x8 baking pan with parchment paper of foil, leaving a border on the sides to make it easy to remove when set. Please note, it will be quite high (about 3-4 inches) You can also use a cake frame of the same dimensions. Cut two 8x8 cake layers in each of the genoises. Place one layer of the chocolate genoise at the bottom of your pan and brush with some rum syrup. Pour half the coconut Bavarian on top and smooth with an offset spatula. Top with a layer of vanilla genoise, brush some rum syrup on top. Pour half the mango mousse and smooth with an offset spatula. Repeat the process with the second half of cakes and creams. Refrigerate until set. Pour the lemon glaze over the cake and let set in the fridge. Cut through the cake with a knife dipped in hot water to prevent breaking the glaze instead of slicing through it. If you wish to add chocolate brush strokes, dissolve about a teaspoon of cocoa with a tablespoon of water and brush onto the set mango mousse with a pastry brush. Once dry, pour on the lemon glaze. You can also substitute the chocolate brush strokes with matcha brush strokes by using matcha instead of cocoa. For the best taste let the cake sit overnight in the fridge before eating it.
Recipe by IronWhisk at http://www.ironwhisk.com/2011/10/a-crate-full-of-mangoes-and-a-bushel-of-coconuts-mango-chocolate-coconut-cake/