Coconut and Marzipan Macaroons

Step 1
Preheat the oven to 300 degrees F (150 degrees C). Grease a baking sheet or line with parchment paper.

Step 2
Beat egg whites in a glass, metal, or ceramic bowl until foamy. Continue beating until stiff peaks form.

Step 3
Combine marzipan with 1/2 of the confectioners' sugar and rub with your fingers until mixture resembles bread crumbs. Add coconut, remaining confectioners' sugar, lemon zest, and rum. Mix well. Fold in stiff egg whites.

Step 4
Using 2 teaspoons, drop small dollops of mixture onto the prepared baking sheet. Sprinkle with sugar.

Step 5
Bake in the preheated oven until the macaroons are golden but soft to the touch, about 20 minutes. Transfer to a cooling rack and cool completely, 30 minutes to 1 hour.

Step 6
Place 3/4 of the chocolate in the top of a double boiler over simmering water. Stir frequently, scraping down the sides with a rubber spatula to avoid scorching, until chocolate is melted, about 5 minutes. Remove from heat and stir in remaining chocolate until melted.

Step 7
Dip 1/3 of each cooled macaroon into the melted chocolate. Set macaroons on waxed paper until chocolate has set. Store the macaroons in an airtight container, with waxed paper between the layers.