Fireball Apple Jell-O Shots

Use a melon baller or teaspoon to hollow out apples, leaving a 1/4" border. Brush cut surfaces with lemon juice. Place each hollow-side up in a muffin tin. In a small saucepan, bring water to boil then pour into a heatproof bowl (or large liquid measuring cup). Stir in Jell-O packet until completely dissolved. Whisk in soda and Fireball.  Carefully pour mixture into hollowed-out apples.  Refrigerate until firm, at least 4 hours.  Slice each apple half into 4 wedges each before serving.