It’s hard to surprise a kid whose lunch you pack every day. But this simple project lets you hide a midday greeting where they least expect it. Just core the apple and stash a note inside. (Make sure to waterproof the paper first by sealing it between two strips of tape.) Then, slice off both ends of the core to make two plugs: one for each end of the hole. Pop them in and, voila! Or, to put it pictorially: At the end, the apple’s returned to its original shape, with a message sealed inside for the eater to discover. What are your favorite ways to get creative with lunchtime eats? Shop for apple corers and other kitchen necessities on Goods.