In a saucepan set over medium heat, heat 1 cup whole milk and 1 cup heavy cream until just starting to bubble, but not boiling. Then remove from the heat.
In a heatproof bowl that you can use as a double boiler (Bain Marie), add 5 large egg yolks, 5 tablespoons white granulated sugar, and a pinch salt. Whisk together until completely smooth.
Very slowly pour in the hot milk and cream mixture, whisking as you pour. Place the bowl on top of a saucepan set over medium-high heat. This is your double boiler.
Use a rubber spatula to continuously stir the mixture as it heats through. At this stage, you are making a crème anglaise. It is ready when it visibly thickens and coats the back of a spoon (about 10-15 minutes).
Place 7 ounces bittersweet chocolate (70% cocoa), finely chopped in a heatproof bowl. When the creme anglaise has thickened, pour it through a sieve over the chopped chocolate and let it sit for 1 minute.
Use an immersion blender to emulsify the chocolate and creme anglaise. If you don’t have one you can stir vigorously with a rubber spatula instead. When properly mixed, the custard and chocolate will become completely smooth and unified. It will look thick and very glossy.
Leave the Chocolate Crémeux in the bowl or pour it into a serving dish. Cover with plastic wrap, pressing down so that the plastic wrap is touching the surface of the Chocolate Crémeux. Place the dish in the refrigerator for at least 6 hours but preferably overnight.
When the Chocolate Crémeux has set, you are ready to assemble the dessert. Heat a dessert spoon by immersing it in boiling water, then dry it off. Make chocolate quenelles by running the hot spoon across the surface of the crémeux. The action is similar to scooping out soft ice cream.
Place the quenelle of chocolate on a dessert plate then drizzle over some caramel sauce, scatter over the berries and chocolate curls.
Notes
We prefer to make Chocolate Crémeux using the double boiler method. This method ensures the custard doesn’t boil and yields a better overall texture. It will take around 15-20 minutes for the Créme Anglaise to thicken. You can judge this by eye and test the mixture by seeing whether it coats the back of a spoon. If you have a thermometer, the custard should reach 180-185oF.
You do not have to use a double boiler and can make the Créme Anglaise in a pan; however, it is very important that the custard is not brought to the boil.
If the Créme Anglaise doesn’t thicken, pour it into a saucepan, but do not allow it to boil.
The Créme Anglaise is poured through a sieve over the finely chopped chocolate. This is because if any egg whites were in the yolks, they would scramble as the Créme Anglaise is cooked. Sieving at this stage ensures that no stray scrambled whites enter the final product.
We transferred the Chocolate Crémeux into a rectangular dish to make it easier to form chocolate quenelles for serving.