Using a canning ring and seal to make a rice burger bun.
Step 1: pack the freshly-cooked sushi rice in a canning ring.
Step 2: put the seal of the canning ring overtop, and press down to compress the rice.
Step 3: Peel the seal off, and then flip the ring (and rice bun) so the edge is up on top. Then, gently, using the back of a spoon, push the rice patty out the ring.
Step 4: Voila! Pan-fry buns to add some crunch, repeat steps for more buns!
The rice bun burger we had, with some pan-fried tofu and sweet onions.