Prepare all the ingredients. Finely grate the truffle and break the chocolate into smaller pieces.
Separate the eggs, placing the egg whites in a clean bowl. In another bowl, combine the egg yolks with the sugar, vanilla sugar, and grated truffle.
Pour the milk and butter into a saucepan and heat over medium heat. Do not let the mixture boil; just warm it through.
Place the chocolate and butter in a small bowl and melt in a double boiler. Once the chocolate has melted, pour it into the egg yolk mixture and mix well.
Whisk the egg whites until stiff peaks form. Gently fold the egg whites into the chocolate mixture.
Sift the flour and gradually add it to the chocolate mixture. Mix well to combine.
Butter a soufflé dish and pour in the chocolate mixture.
Bake in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the soufflé has risen nicely and is golden brown.
Once cooked, let it cool slightly, then serve warm. Garnish with a little extra grated truffle, if desired.
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