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1
Preheat the oven to 375F (190C) and butter one large baking sheet.
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2
Whisk the eggs and yolks together in a bowl.
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3
Transfer 2 tbsp of the mixture to a small bowl and set aside.
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4
Combine the flour, almonds, sugar, baking powder, and orange zest in a large bowl and stir together.
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5
Make a well in the center, add the beaten egg mixture, and stir to form a stiff dough.
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6
Gather the dough into a ball, then cut in half.
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7
On a lightly floured surface, shape each portion into a log about 2in (5cm) wide and 1in (5cm) tall.
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8
Place the logs well apart on the baking sheet.
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9
Flatten them slightly and brush the tops with some of the reserved egg mixture.
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10
Bake for 20 minutes or until logs are lightly browned and feel set when pressed in the center.
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11
Remove from the oven and increase the temperature to 400F (200C).
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12
Cool the logs for 10 minutes.
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13
Transfer to a cutting board.
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14
With a serrated knife held on a slight diagonal, cut into 1/2 in (1cm) pieces.
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15
Return the slices to the baking sheet, flat sides down, and continue baking for 8 minutes more, or until crisp and golden.
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16
Cool on the baking sheet for 5 minutes, then transfer to wire racks to cool completely.
