Glowing Mini Cupcakes

Follow the instructions on a box cake mix—or use your favorite recipe—to make chocolate cupcakes. (We love these recipes, if you want to make some from scratch.) Let the cupcakes cool, then frost with vanilla buttercream. Place the cupcakes in the freezer for at least 30 minutes—or overnight—so the frosting can stiffen. Make the glowing glaze: Bring the cup of water to a boil, whisk in the Jell-o mix until it's dissolved and remove it from the heat. Whisk in the chilled tonic water. Let it cool to about room temperature without setting. (Wiggle the pot every few minutes to make sure it's not thickening; this process will take about 10-15 minutes.) Dip the frosting of each cupcake into the glaze. Once all are dipped, put them back in the freezer for a few minutes to harden. Repeat the dipping process four more times for optimal glow. Serve.