your fridge. Fill each of the orange halves with jelly right to the top. Don't worry if some of the jelly spills, it is easy to remove once set. Refrigerate the oranges until the jelly is set (allow 3-4 hours). Once set, place the orange flat side down on a chopping board and cut in half using a serrated knife. Next flip the orange quarter onto a flat side and trim any excess skin from around the edge of the jelly. Repeat until all the oranges are trimmed to neat boat shapes. Once all the jelly is set, place a boat into each cup and top with a pirate flag. Make Ahead Notes: These jelly boats can be make 3 days in advance of the party. Simply cover and refrigerate until needed. Decorate wtih a pirate flag just before serving.