Julienne Mango, cube avocado and cut tuna into small chunks.
Marinade tuna with 1 Tbsp ponzu sauce.
Season sushi rice with sushi vinegar.
Place a sushi tower mold or cookie ring onto the serving plate.
Spoon in the seasoned sushi rice, then press with the damper or a spoon tip.
Next add mango and press.
Repeat with avocado and tuna chunks. If your cookie ring is too short to add these layer, slightly pull it up to create the space.
Press with the damper or spoon tip while pulling the mold/ring out.
Taper in any falling ingredients, then sprinkle with all the desired garnishment.