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For the finale, Mary and Paul test how far the bakers have grown in skill and creativity. The Signature challenge is a technically difficult picnic pie, packed with fillings that form a creative design, surrounded by shortcrust pastry with perfectly baked sides. The Technical is 12 perfectly shaped pretzels: six savory with rock salt and six sweet with poppy seeds topped with orange zest and glaze. The year's final Showstopper is the ultimate showpiece in a baker's repertoire: a three-tiered wedding cake.