Blue Cheese Souffle

Name: Blue Cheese Souffle
Ingredients: 3 tablespoons unsalted butter, plus extra for greasing the dish; 1/4 cup finely grated Parmesan, plus extra for sprinkling; 3 tablespoons all-purpose flour; 1 cup scalded milk; Kosher salt and freshly ground black pepper; Pinch cayenne pepper; Pinch nutmeg; 4 extra-large egg yolks, at room temperature; 3 ounces good Roquefort cheese, chopped; 5 extra-large egg whites, at room temperature; 1/8 teaspoon cream of tartar