A Potato-Fennel Gratin Fit Enough For Company

The best-tasting potatoes–obviously–can be had in fall when they're harvested and the stores are brimming with a large variety of different kinds and sizes. I made the following recipe for a potato-fennel gratin tonight for guests and it was a hit with everyone. The recipe is almost exactly taken from Ina Garten's The Barefoot Contessa Cookbook.

Potato-Fennel Gratin

Ingredients:

2 fennel bulbs

1 yellow onion, halved and thinly sliced

2 Tbsp. pure olive oil

1 tbsp. unsalted butter

2 pounds potatoes (russet or Yukon Gold)

2 cups heavy cream

2 1/2 cups grated Gruyère cheese (1/2 lb.)

1 tsp. kosher salt

1/2 tsp. freshly ground black pepper

Preparation:

Preheat the oven to 350˚F and butter an 9x13-inch casserole dish. Remove the stalks from the fennel and cut the bulbs in half lengthwise. Remove the cores and thinly slice the bulbs crosswise. Sauté the fennel and the onions in the olive oil and butter on medium-low heat until tender.

Peel the potatoes and slice them thinly, about 1/8 inch thick. Mix the sliced potatoes in a large bowl with 2 cups of cream, 2 cups of Gruyère, salt and pepper. Add the sautéed fennel and onion and mix well.

Pour mixture into the prepared casserole dish. Press down to smooth the potatoes. Sprinkle the top with about 1/2 cup of grated Gruyère. Bake uncovered for 1 1/2 hours, until the potatoes are very tender and the top is browned nicely. Allow a few minutes to cool and set before serving.

The recipe makes about 10 servings and can be made days ahead of time and reheated at 350˚F for about 30 minutes. (Let the gratin come to room temperature before reheating. If not, the time for reheating needs to be increased.)