LEEK, POTATO, AND MOREL GRATIN

Leek, Potato, and Morel Gratin image

Provided by Martha Stewart

Time 1h45m

Number Of Ingredients 9

2 tablespoons unsalted butter, softened, plus more for dish
1 cup heavy cream
1/2 cup low-sodium chicken broth
1 1/2 ounces (1 cup) fresh morel mushrooms, washed, patted dry, and halved or quartered if large
1 stem green garlic, trimmed and cut into 1/4-inch slices (or 2 small cloves fresh garlic, sliced)
1 1/2 pounds white all-purpose or Yukon Gold potatoes (3 medium)
2 medium leeks (white and pale-green parts only), cut on the diagonal into 1/2-inch slices and rinsed well
Coarse salt
Zest of half a lemon

Steps:

Preheat oven to 375 degrees. Generously butter a 2 1/2-quart baking dish. Bring cream, broth, morels, and green garlic to a simmer.
Assemble the gratin: Peel potatoes, and cut crosswise into slices slightly thicker than 1/8 inch. Layer potatoes in dish, overlapping slightly. Spread half the leeks over top, and season with salt. Pour half the cream mixture over top. Repeat.
Cover gratin with foil, and bake 40 minutes. Uncover, and bake until potatoes are tender and golden and most of the liquid is absorbed, 20 to 25 minutes more. Let cool 15 minutes. Before serving, sprinkle with lemon zest.