Grand Marnier Souffle | America's Test Kitchen

Ingredients

• 3 tablespoons unsalted butter, room temperature
• 3/4 cup granulated sugar
• 2 teaspoons sifted cocoa powder
• 5 tablespoons unbleached all-purpose flour
• 1/4 teaspoon table salt
• 1 cup whole milk
• 5 large eggs, separated
• 1 tablespoon grated orange zest from 1 medium orange
• 3 tablespoons Grand Marnier
• 1/8 teaspoon cream of tartar