Dark Chocolate Soufflé with Grand Marnier Crème Anglaise

Ingredients

• 1 tablespoon butter, melted, for the ramekins
• 1/3 cup sugar, plus a little more for the ramekins
• 3 eggs, yolks and whites separated
• 2 ounces good quality dark chocolate, finely chopped
• 1/4 teaspoon cream of tartar
• Pinch Kosher salt
• 1 cup whole milk
• 1 cup heavy cream
• 1/4 - 1/2 teaspoon orange zest
• 4 egg yolks
• 1/2 cup sugar
• 1 tablespoon Grand Marnier