Hasselback Potato Gratin Is the Side Dish All Your Holiday Parties Need
"We're here to teach you the art of come-in-from-the-cold cuisine...."
INGREDIENTS
•
2 tbsp.
•
olive oil, plus more for baking dish
3
•
medium onions, thinly sliced
Kosher salt and freshly ground black pepper
2 1/2 c.
•
heavy cream
4
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garlic cloves, thinly sliced
1 tbsp.
•
chopped fresh thyme
1 tbsp.
•
chopped fresh rosemary
8 oz.
•
Gruyère, grated (about 2 cups), divided
4 oz.
•
Parmesan, grated (about 1 cup), divided
3 1/2 lb.
Yukon gold potatoes, peeled and sliced 1/4-inch thick
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