Leeks look like big green onions and taste like a cross between a mildly flavored onion and garlic. Cut off the root end and darker portions of the green leaves. Split in half lengthwise, and wash thoroughly before slicing.
Southern Living NOVEMBER 2005
Melt butter in a 3-quart saucepan over medium heat; add leeks, and sauté 5 minutes or until tender (do not brown). Add garlic; sauté 1 minute.
Whisk in flour; cook, whisking constantly, 1 minute. Gradually whisk in milk. Stir in 2 teaspoons salt and next 3 ingredients.
Cook over medium heat, whisking constantly, until mixture thickens. Remove from heat; stir in cheese until melted and smooth.
Layer half of potatoes in a lightly greased 13- x 9-inch baking dish; pour half of sauce evenly over potatoes in dish. Repeat layers, ending with sauce.
Bake, uncovered, at 375° for 50 minutes or until potatoes are golden brown and fork tender, shielding with aluminum foil to prevent excessive browning, if necessary. Remove from oven, and let stand 10 minutes.
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