INGREDIENTS
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3 tablespoons/45 ml butter, plus more for greasing
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2 pounds/1 kg baby spinach
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1 onion, chopped
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1 clove garlic, minced
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2 tablespoons/30 ml all-purpose flour
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1 cup/250 ml 35-percent cream
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1 cup/250 ml milk
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2 cups/500 ml grated Emmental cheese
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Kosher salt and freshly ground black pepper