Balsamic Onion Potato Gratin
Source of Recipe
recipes-from-friends.com
List of Ingredients
4 tablespoons (1/2 stick) unsalted butter
1 large or 2 medium yellow onions
Salt and pepper to taste, divided
3 tablespoons aged balsamic vinegar
6 large Yellow Finn potatoes (2 1/2 pounds), peeled and thinly sliced
1 cup warm heavy cream, divided
1/4 cup grated Paremsan cheese, divided
Recipe
Preheat the oven to 350 degrees. Lightly coat a shallow, oval gratin dish or an 8-cup (2 quart) pyrex baking dish with butter.
In a skillet, melt the remaining butter and add the sliced onions. Over medium heat, cook the onions for 5 to 7 minutes or until translucent. Season with salt and pepper. Add the vinegar to the onions and simmer for 2 to 3 minutes. Remove the pan from the heat and set aside.
Place the sliced potatoes in a large bowl in the sink and soak in running water for several minutes. (This removes any excess starch.)
To assemble the gratin, arrange a layer of slightly overlapping potato slices in the prepared dish. Cover with one half of the onion mixture. Ladle the warm cream over the onions and sprinkle with 1 tablespoon of the grated cheese and salt and pepper. Repeat, using the same ingredients and ending with a third potato layer. Sprinkle the remaining 2 tablespoon cheese over the top.
Bake for 40 to 45 minutes, or until the potatoes are tender and the top is well-browned. Remove from the oven and let the dish rest for 10 minutes before serving
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