1. Peel and core the pineapple. Set aside one slice of the pineapple and cut the pineapple and mangoes into chunks for juicing.
2. Peel the ginger, grate, and set aside.
3. Using a juice extractor, juice the fruit chunks and ginger into a large glass measuring cup and whisk in the vanilla.
4. To serve, quarter the reserved pineapple slice, pour the juice over crushed ice and garnish with the quartered pieces.