In a standing mixer fitted with the paddle attachment on medium speed, or by hand using an electric mixer, beat egg until frothy. Add brown sugar and beat until fluffy. Reduce speed to low and stir in honey and molasses.
Sift together flour, nutmeg, cinnamon, baking soda, ground cloves, and allspice. With standing mixer speed on medium-low, slowly add flour mixture and mix well. Stir in almonds and raisins. Cover bowl and chill for 2 hours or overnight.
Preheat oven to 350 degrees. Grease two rimmed baking sheets well. On a floured surface, roll out dough to 1/4-inch thick. Cut dough into 3 1/2-inch by 2-inch rectangles and space 12 evenly apart on each baking sheet. Bake until golden brown, about 12 minutes. Remove from oven and cool on rack.
To make the glaze:
In a small bowl, combine 1 beaten egg white with lemon juice, lemon zest, a pinch of salt, and powdered sugar. While cookies are still warm, brush with lemon glaze.
Dark molasses: Commonly used in gingerbread or ginger cookie recipes, dark molasses is less sweet, slightly more bitter, and thicker in consistency than its lighter cousin.
Allspice: This clove relative is a spice that tastes similar to a mash-up of cinnamon, nutmeg, and cloves. If you don't have any on-hand, make your own mix of 1 3/4 teaspoons ground cinnamon, 3/4 teaspoon ground nutmeg and a small pinch of ground cloves; use 1/4 teaspoon of this blend in the Lebkuchen.
Almonds: Regular slivered almonds work fine, but I love the way roasting amplifies the nuttiness. To roast slivered almonds, evenly spread the slivered almonds on a sheet pan and roast in a 325-degree oven for 5 to 10 minutes.
Raisins: If your raisins feel more dried out than you'd like, plump them up by soaking them in some warm water before adding them to the Lebkuchen cookie dough. Pat dry with a paper towel after soaking. If you’re not a fan of raisins, choose your own adventure with dried cranberries, currants, nuts, or chocolate chips instead.
Egg white: Or pasteurized egg whites or meringue powder, if you prefer.
Yield: This cookie recipe makes 24 Lebkuchen cookies. Double if desired to share as a food gift or freeze some for later.
Storage: Store these cookies in an air-tight container at room temperature for 2 weeks or in the refrigerator for 2 months.
Make ahead: This is one cookie recipe that should be made ahead (so the cookies don’t spread too much while baking), so get a head start on the cookie batter. Mix and chill the dough at least 2 hours or up to 4 days in advance.