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Author Notes: I don't know many people who would turn down a potato gratin, do you? What I love about this classic dish, other than its near universal appeal, is that it is deceptively simple to make relative to its beauty. Plus, you can probably make it with what you have in your fridge and pantry right now.
My go-to gratin is the one I learned in cooking school; it relies on garlic-infused milk instead of cream, and the potatoes are thinly sliced and added to the baking dish raw. (I find par-boiled gratins are often grainy and/or mushy, and you can't layer the potatoes into the dish in as pretty and precise a pattern if you've already cooked them.) Other than the garlic, for flavor all you add is salt, pepper, and some Gruyère cheese -- that's it. You bake the gratin in a hot oven until the potatoes are tender and the milk thickens into a sauce, and you've got a gorgeous, versatile side dish.
After having relied on my old standard for over 15 years (yikes!), I decided to shake things up a bit. With all the lovely roots and tubers appearing in the markets, why not apply the same technique to a mix of vegetables? And maybe I could even throw in some herbs and switch up the cheese while I was at it. —Merrill Stubbs
- 1 1/2 cups whole milk
- 2 cloves garlic
- Pinch freshly grated nutmeg
- 2 tablespoons extra virgin olive oil
- 3/4 pound butternut squash
- 3/4 pound white potatoes
- 1/2 pound parsnips
- Salt and pepper
- 1/4 teaspoon chopped fresh thyme leaves
- 1/4 teaspoon finely chopped fresh rosemary
- 1 cup grated Gruyère
- 1 cup grated Pecorino
- Heat the oven to 400° F. Put the milk in a small heavy saucepan and peel and smash one of the garlic cloves. Add it to the milk and then heat the milk over low heat until it just starts to bubble at the edges. Remove from the heat, add the nutmeg and let steep while you continue with the recipe.
- Peel the second garlic clove, cut it in half and rub the cut side around the inside of a 6-cup baking dish no more than 2 inches deep. Rub 1 tablespoon of the oil all over the inside of the dish.
- Peel the squash, potatoes and parsnips and cut them into very thin slices (1/8-inch thick). If you have a mandoline, now's the time to use it.
- Layer the vegetables into the baking dish, alternating between squash, potato and parsnip, and fanning them into concentric, overlapping circles. Season generously with salt and pepper and sprinkle a third of the cheese and a third of the chopped herbs over the slices. Repeat twice, making the top layer as neat and tidy as you can.
- Remove the garlic clove from the hot milk and pour the milk evenly over the vegetables. Drizzle the remaining olive oil over the top of the gratin and bake for about 50 minutes, until the top is browned and bubbly and the vegetables yield easily when you poke them with a sharp knife. If the vegetables are tender but the top isn't as brown as you'd like, turn on the broiler for a couple of minutes -- watch it carefully so it doesn't burn! Let the gratin cool for at least 5 minutes before serving.
- This recipe is a Community Pick!