- Rinse the sushi rice in cold water 3-4 times or until the water runs clear. Rinsing the starch out may seem like a hassle but it will make the onigiri easier to work with. Once rinsed thoroughly, add the stock cube, water and rice in a pan an bring to the boil. Once boiling, reduce the heat and stir occasionally until the rice has absorbed all of the water.
- Whilst your rice is on, you can use a craft knife or a pair of scissors to cut the superhero masks and cape out of the nori strips.
- Once the rice is ready, take the pan off the heat and transfer the rice into a bowl, leaving it to cool. Stir the rice occasionally to prevent it from clumping together as it cools.
- When the rice is no longer warm to the touch, you can start to make your figures. Grab a handful of rice in the palm of your hand, and press it down to make a thick circle. Add a piece of mackerel into the middle, and then roll the rice around the mackerel in your hand. Keep rolling the ball around in your hand to get a good shape, though bear in mind that the longer you handle the rice, the stickier it gets! To add your seaweed decoration, simply wet the nori slightly to add your masks.
Fun tips: You can use this method to make nearly any character and can easily substitute the white rice for brown, or fill the characters with a mix of seafood and veggies!