01 -
Take a wooden skewer and carefully poke two holes (on opposite sides) in the top-back area of the croissants. Wiggle the skewer to hollow out the inside. Set them aside for now.
02 -
Mix together sugar, egg yolks, salt, and cornstarch in a small saucepan. Combine until smooth and lump-free. Slowly whisk in the light cream until it's all blended.
03 -
Place the saucepan over medium heat. Constantly whisk the mixture as it cooks to prevent sticking and lumps. Wait until it thickens up and looks smooth, which should take 4-6 minutes. Take it off the heat right away.
04 -
Drop in butter cubes a bit at a time, whisking fully before adding another. Add vanilla last and mix thoroughly. For a smoother texture, optional: press through a fine strainer.
05 -
Fill a piping bag with the custard (use a long nozzle). Push the tip into the holes in each croissant. Squeeze gently until filled, aiming for about one-third of the custard per croissant.
06 -
In a small pot (don’t turn on the heat yet), stir together light cream and corn syrup. Move to medium-low heat and whisk constantly until warm. Take it off the heat, toss in chopped chocolate, and stir until it’s melted. Let it rest for a couple of minutes.
07 -
Spoon ganache over the tops of the custard-filled croissants. Sprinkle the chopped nuts for garnish. Refrigerate for an hour before serving.