Place the egg whites in a clean, dry bowl and beat on medium speed until soft peaks form.
Gradually add the powdered sugar, beating constantly until the meringue is glossy and stiff peaks form.
Add the grated orange zest, cinnamon, and lemon juice, then gently fold to incorporate the flavors evenly into the meringue.
Transfer the meringue to a piping bag fitted with a star tip. Pipe small circles onto a baking sheet lined with parchment paper to form the cookies.
Place the meringue cookies in a preheated oven at 200°F (90°C) and bake for about 1.5 hours, or until they are completely firm but not browned.
Remove from the oven and let cool completely. Carefully peel them off the parchment paper and serve.
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