 Cook's Country Rolled Soufflé for a Crowd - Instructions Continued
heat, whisk in Parmesan; reserve 1/3 cup of milk mixture. Scrape remaining milk mixture into large bowl, let sit until slightly cooled, about 10 minutes, and then whisk in egg yolks.
3. Using stand mixer fitted with whisk, whip egg whites and cream of tartar on medium-low speed until foamy, about 1 minute. Increase speed to medium-high and whip until stiff peaks form, 3 to 4 minutes. Gently fold one-third of beaten egg whites into milk-yolk mixture. Using rubber spatula, fold in remaining egg whites until no white streaks remain. Spread mixture onto prepared baking sheet. Bake until golden brown and set, 22 to 24 minutes. Let cool in pan for 30 minutes. Reduce oven to 325 degrees F.
4. For the filling: Combine reserved milk mixture, spinach, Gruyere, chives, milk, pepper and salt in bowl and microwave until hot, 1 to 2 minutes. Spread spinach
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