Souffle a L'orange Recipe

Ingredients

• 1/2 tablespoon unsalted butter, at room temperature
• 2 tablespoons granulated sugar
• 2 tablespoons unsalted butter
• 3 tablespoons all-purpose flour
• 3/4 cup whole milk
• 1/4 cup granulated sugar
• 4 extra-large egg yolks, at room temperature
• 2 tablespoons orange liqueur
• 2 teaspoons pure vanilla extract
• 1/2 teaspoon grated orange zest
• 5 egg whites, at room temperature
• 1/4 teaspoon cream of tartar
• Pinch kosher salt
• Confectioners' sugar, for serving