INGREDIENTS
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1 head savoy cabbage, cored, cleaned, and shredded
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1 (2-inch) piece slab bacon, thinly sliced
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2 tablespoons unsalted butter, plus more for greasing the gratin dish
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4 garlic cloves, finely chopped
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1/2 bunch fresh chives, finely chopped to 1/4 cup
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Sea salt and freshly ground black pepper
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2 pounds baking potatoes, unpeeled and thinly sliced (about 1/8-inch), see Cook's note*
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2 1/2 cups heavy cream
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2 cups grated Parmesan