INGREDIENTS
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4 tablespoons unsalted butter
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2 medium-sized yellow onions, chopped
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1/4 cup unbleached flour
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3 cups organic whole milk
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1/4 teaspoon freshly grated nutmeg
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pinches of cayenne
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1 and 1/2 cup grated Gruyere cheese
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3 16 oz. bags of organic, chopped spinach - thawed
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1/2 to 1 teaspoon kosher salt
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1/4 to 1/2 teaspoon ground white pepper
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2 tablespoons unsalted butter
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1 and 1/2 cup panko breadcrumbs
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sea salt, to taste