The idea here is an elegant appetizer: a thin potato tart with some depth of flavor and balance, inspired by beautifully arranged French apple tarts. The ingredients are pretty simple, but careful preparation is key – if the potatoes are not sliced thinly enough, they won’t cook fully until the pastry is overdone. For variation, top the tart with sprigs of thyme or rosemary before baking, and skip the watercress.

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