Place a ring mould on a serving plate. Stick marinated cucumber / carrot strips around the inside of the ring.
Add a layer of seasoned rice at the bottom of the ring, gently pressing down with a spoon/ silicone spatula.
Next, place a layer of carrot and cucumber strips on top of the rice, followed by a layer of smashed avocado.
Add a second layer of sushi rice (pressing down again with a silicon spatula/ spoon).
Gently remove the ring mould and delicately garnish as desired: e.g. with pickled vegetables, edamame and black sesame seeds, curled mango slices and black sesame seeds etc. Finish with a drizzle of vegan Sriracha mayo. Serve with more mayo on the side and soy sauce for dipping.