 Cook's Country Rolled Soufflé for a Crowd - Instructions Continued
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 filling evenly over cooled egg sheet. Using parchment overhang, lift long edge of egg sheet and roll to opposite edge (parchment should encase roulade when rolling). With roulade still resting on edge of parchment, pull roulade to center of baking sheet, and finally roll it off seam side down onto foil; discard parchment.
Cover roulade with foil, and bake until hot throughout, about 25 minutes. Slice into 1-inch-thick slices and serve.
To make ahead: Roulade can be prepared through step 4, wrapped in plastic wrap, and refrigerated for up to 24 hours. To serve, discard plastic and proceed with step 5, increasing baking time to 35 minutes.
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