INGREDIENTS
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3 lb. Brussels sprouts, trimmed and halved
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Kosher salt
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3 garlic cloves, chopped
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2 tbsp. unsalted butter
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1/4 c. all-purpose flour
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2 c. half-and-half
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9 oz. grated Gruyère cheese, divided (about 2 cups total)
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Kosher salt
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Freshly ground black pepper