Start by rinsing the sushi rice under cold water until the water runs clear. This removes excess starch and prevents the rice from becoming gummy.
In a medium saucepan, combine the rinsed sushi rice and water. Bring it to a boil over medium heat, then reduce to low, cover, and simmer for 20 minutes, until the water is absorbed. Remove from heat and let it sit for 10 minutes without removing the lid.
In a separate bowl, mix the coconut milk, sugar, vanilla extract, rice vinegar, and gelatin powder until well combined and the gelatin is dissolved.
Once the rice has rested, fluff it with a fork and gradually fold it into the coconut mixture until the rice is evenly coated.
Grease a Bundt pan with a non-stick spray or coconut oil. Press one-third of the rice mixture into the bottom of the pan to form a base layer.
Add a layer of diced mango on top of the rice base, followed by another third of the rice mixture. Press down firmly.
Repeat with layers of kiwi and then the remaining rice mixture on top. Cover all fruit completely with the final layer.
Chill the Bundt cake in the refrigerator for at least 4 hours to set. For best results, let it chill overnight.
Once set, carefully invert the Bundt pan onto a serving plate. Gently tap or shake the pan to release the cake.
Garnish the top of the cake with shredded coconut and toasted sesame seeds. You can also add edible flowers for a colorful presentation.
Slice and serve the sushi Bundt cake chilled, allowing your guests to enjoy a fun and unique treat that resembles traditional sushi rolls.