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FROZEN PUFF PASTRY can make any cook look good. It comes ready to bake, in buttery, immaculately layered sheets, yet gives the impression that no amount of kneading and rolling was spared.

At his eponymous New York City restaurant, German chef Günter Seeger constructs elegant savory pastries from scratch, and with a stash of frozen puff pastry on hand you can approximate his handiwork at home. This onion tart, Mr. Seeger’s first…