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Lightly grease two baking sheets, or line them with parchment.
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Beat together the eggs, sugar, salt, Fiori, and zest for 5 to 6 minutes, until the mixture is very light and falls in thick ribbons from the beater.
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Gradually mix in the flour to form a stiff dough. Wrap the dough in plastic and allow it to rest at room temperature for 30 minutes.
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Lightly dust your work surface and Springerle mold with flour. Tap the mold to remove excess flour.
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Divide the dough in half, re-wrap one piece in plastic, and roll the other piece ¼" thick.
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Press the mold firmly into the dough, then remove. Cut around the design with a knife, and transfer the cookie to a baking sheet. Repeat until you've used all the dough.
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Repeat with the remaining piece of dough.
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Allow the unbaked cookies to dry at room temperature, uncovered, for 24 hours, turning them over once during that time.
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Preheat the oven to 250°F.
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Bake the cookies for 35 to 40 minutes, until they're firm but not brown. Remove them from the oven, and transfer them to a rack to cool completely.
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Yield: 2 1/2 to 3 dozen cookies.