Start by washing and peeling the apples. Cut them into uniform slices, roughly ½ inch thick.
In a large mixing bowl, combine the sliced apples, granulated sugar, ground cinnamon, and lemon juice. Toss the mixture until the apples are evenly coated.
Prepare your slow cooker by greasing the interior lightly with butter or cooking spray.
Place the coated apple slices into the slow cooker.
In a microwave-safe bowl, melt the butter. Once melted, stir in the water and vanilla extract.
Pour the melted butter mixture over the apples in the slow cooker.
Cover the slow cooker with the lid and set it on low heat. Cook for about 3 hours, stirring occasionally to prevent sticking.
Once the apples are tender and caramelized, turn off the slow cooker and let them cool slightly before serving.
Serve the fried apples warm, optionally with a scoop of vanilla ice cream for a delightful dessert.