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Preheat oven to 400F. Butter a 1-quart gratin or
shallow baking
dish. Bring a large saucepan of salted water to
a boil. Peel
potatoes and cut into thin slices (about 1/8-inch
thick). Add
potatoes to boiling water and parcook 4 minutes.
Drain potatoes
well in a colander.
In gratin or baking dish, arrange potatoes, overlapping
them, in
3 layers, sprinkling first 2 layers each with 1/4
cup Gruyere and
salt and pepper, to taste. In a small bowl whisk
egg and add hot
milk in a stream, stirring constantly. Season mixture
with salt
and pepper and pour evenly over potatoes. Sprinkle
the potatoes
with remaining 1/4 cup cheese and bake until top
is golden and
potatoes are tender, about 30 minutes.