1Preheat the oven to 350F (330F if using a convection oven).
2The first step is making the brownies, which are the base of the dome. Cream the butter, sugar, and glucose. Whisk in the eggs until smooth and creamy. Stir in the melted chocolate. Add the flour and pecans. Mix well.
3Place a silicone mat on a jelly roll pan and pour the brownie batter on it. Bake for about 15 minutes.
4Cool and transfer the brownies from the pan onto a parchment paper. Cut out the circles that will be placed under the domes. Set aside.
5Next start the chocolate custard. Soak the gelatin in cold water.
6In a bowl, mix the egg yolks and sugar.
7Heat the milk and cream in a medium saucepan. Pour a bit into the egg yolks and sugar and stir quickly. Add the rest of the hot liquid and stir. Return the mixture to the saucepan and thicken it over low heat. Off heat, stir the softened gelatin and dark chocolate into the thickened custard.
8Half-fill 6 dome-shaped silicone molds with custard. Let set for 1 hour in the refrigerator.
9Meanwhile, start working on the chocolate mousse. Soak the gelatin in cold water.
10Whisk the egg yolks and sugar together in a bowl.
11Heat the milk and cream in a medium saucepan. Once heated through, pour a little into the egg yolk and sugar mixture. Stir until well combined then add the rest of the hot liquid. Return the mixture to the saucepan and thicken over low heat. Off the heat, stir in the softened gelatin and melted chocolate. Fold in the whipped cream.
12Layer the chocolate mousse over the chocolate custard in the silicone molds. You can either fill the silicone molds to the top with mousse or leave some room for a brownie layer. Place the molds in the freezer overnight to make unmolding much easier.
13To make the icing, soak the gelatin in some cold water.
14Boil the water, sugar, cocoa, and cream. Take it off the heat, add the softened gelatin, and mix well. Let the icing cool completely before putting it on your domes.
15Take the domes out of the freezer 4 hours before icing them. If you did not put a brownie layer in your molds, unmold them onto the brownie shapes prepared earlier. Ice the domes and refrigerate for 2 hours before serving.
16Remove the domes from the fridge and decorate them with star-shaped white chocolate. Serve.