Root Vegetable Gratin

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Appears in Cook's Illustrated March/April 2015, America's Test Kitchen TV

Root vegetables add complex flavor to the all-potato classic, but how do you get the different types to cook evenly? A glass of wine helps.

SERVES 6 to 8

TIME 2¼ hours, plus 25 minutes resting

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WHY THIS RECIPE WORKS

Our root vegetable gratin pairs the earthy flavor of potatoes with thinly sliced sweet rutabaga and savory celery root. We allow these flavors to come to the fore by adding just a few aromatics: onion, garlic, thyme, and Dijon mustard. We a...

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