Imagine all of the comfort of potatoes gratin encased in a flaky savory tart. The potatoes are joined by celery root and porcini, with the flavors melding together to create something deeply savory and comforting. Despite the fact that it's carbs on carbs (potatoes inside a tart dough), this dish doesn't feel like a heavy bomb in your stomach. The thin slices of potato and celery root feel elegant alongside a touch of cream (they're not swimming in cream like a traditional gratin). <br /> <br />You can certainly enjoy this tart without the arugula pesto, but the minimal effort required to make this simple pesto will provide you with a bright, peppery, lemony counterpoint to the savory tart. It's worth it.

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