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Preheat oven to 325 degrees.
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In a large bowl, sift flour, baking powder, salt, and cinnamon.
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In another bowl, cream butter and sugar. Add vanilla.
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Add eggs one at a time and mix until combined.
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Add lemon juice and mix until combined.
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Add dry ingredients to wet ingredients. Fold in macadamia nuts.
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Turn the dough onto a floured surface and divide into two. Shape each ball of dough into a log.
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Place the logs on a cookie sheet lined with parchment paper.
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Bake for 25 minutes, or until lightly brown.
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Let cool 5 minutes.
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With a serrated knife, slice diagonally into 1/2"-thick pieces.
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Return the biscotti to your parchment paper lined cookie sheet and bake 8 minutes.
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Turn biscotti and bake an additional 8 minutes.
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Remove from oven and cool before storing in an airtight container.