Traditionally baked for Christmas and Easter festivities, these buttery shortbread cookies call for a trio of classic Greek ingredients: almonds, honey, and a special liqueur made from the resin of the mastic tree.
Preheat oven to 325 degrees. Sift together flour, almonds, confectioners' sugar, and salt into a medium bowl.
In the bowl of an electric mixer fitted with the paddle attachment, beat together butter and honey on medium speed until fluffy. Beat in vanilla and lemon zest. (It may not come together fully until you add flour mixture.) Reduce speed to low; gradually beat in flour mixture, alternating with mastiha.
Scoop 1 tablespoon of dough; roll into a ball. Transfer to a parchment-lined baking sheet. Repeat with remaining dough, spacing 2 inches apart. Bake until brown around edges, about 20 minutes. Transfer sheets to wire racks; let cool completely. Roll cookies in confectioners' sugar until thoroughly coated. Cookies can be stored in an airtight container at room temperature up to 1 week.