Ingredients
- 1/4 cup (1/2 stick) unsalted butter
- 6 tablespoons all purpose flour
- 1 1/4 cups buttermilk
- 1 9- to 10-ounce package frozen chopped spinach, thawed, squeezed dry
- 1 1/2 cups grated Parmesan cheese
- 6 large egg yolks
- 2 teaspoons coarse kosher salt
- 3/4 teaspoon freshly ground black pepper
- 8 large egg whites
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