Follow these steps carefully to achieve perfectly crispy rice cakes every time:

Phase 1: Preparing the Rice Base

1. Rinse the Rice: Place the short-grain rice in a fine-mesh sieve and rinse under cold running water until the water runs mostly clear. This removes excess starch and prevents overly gummy rice. Drain well.
2. Cook the Rice: Transfer the rinsed rice to your rice cooker or a medium saucepan. Add the 2 ½ cups of water (or the amount specified by your rice cooker). If using a saucepan, bring to a boil, then reduce heat to the lowest setting, cover, and simmer for 15-20 minutes, or until all water is absorbed. Do not lift the lid during this time. Once cooked, let it stand, covered, for another 10 minutes to steam.
3. Season the Rice: While the rice is resting, combine the seasoned rice vinegar, sugar, and salt in a small bowl. Whisk until the sugar and salt are completely dissolved. You can gently warm this mixture for a few seconds in the microwave to help it dissolve faster.
4. Combine Rice and Seasoning: Fluff the cooked rice gently with a rice paddle or spatula. Transfer the hot rice to a large, non-metallic bowl. Gradually pour the vinegar mixture over the rice while using a cutting and folding motion with the paddle to incorporate it evenly. Be careful not to mash the rice grains. Fan the rice (traditionally with a Japanese fan, but a piece of cardboard works) as you mix to help cool it down slightly and give it a nice sheen.
5. Press the Rice: Line an 8×8 inch square baking pan (or a similar sized rectangular container) with plastic wrap, leaving some overhang on the sides. This will make it easier to remove the rice later. Lightly dampen your hands or the rice paddle with water to prevent sticking, then transfer the seasoned rice into the prepared pan. Spread it out evenly and press down firmly and uniformly to create a compact layer about ½ to ¾ inch thick. You want it dense so it holds its shape. You can use the bottom of a flat glass or another smaller pan to press it down.
6. Chill the Rice: Cover the pan tightly with more plastic wrap, pressing it directly onto the surface of the rice to prevent a skin from forming. Refrigerate for at least 4 hours, or preferably overnight. This chilling step is crucial – it allows the rice to firm up completely, making it easy to cut and ensuring it doesn’t fall apart during frying.

Phase 2: Frying the Rice Cakes

1. Cut the Rice: Once thoroughly chilled, use the plastic wrap overhang to lift the block of rice out of the pan and onto a clean cutting board. Remove the plastic wrap. Using a sharp, slightly dampened knife, cut the rice block into desired shapes. Squares (about 1.5 to 2 inches), rectangles, or even circles (using a cookie cutter) work well. Dampen the knife between cuts if it starts to stick.
2. Prepare for Frying: Place a wire rack over a baking sheet lined with paper towels. This will be for draining the fried rice cakes.
3. Heat the Oil: Pour about ½ to 1 inch of neutral cooking oil into a heavy-bottomed skillet or Dutch oven. Heat the oil over medium-high heat until it reaches 350-375°F (175-190°C). If you don’t have a thermometer, you can test the oil by dropping a small piece of rice into it; if it sizzles vigorously and turns golden brown in about 30-60 seconds, the oil is ready.
4. Fry the Rice Cakes: Carefully place a few rice cakes into the hot oil, being sure not to overcrowd the pan. Overcrowding will lower the oil temperature and result in soggy, greasy rice cakes. Fry for about 2-4 minutes per side, or until they are beautifully golden brown and crispy. The exact time will depend on the thickness of your cakes and the oil temperature.
5. Drain Excess Oil: Using a slotted spoon or spider, carefully remove the golden rice cakes from the oil and transfer them to the prepared wire rack to drain. The paper towels underneath will catch any drips. If desired, you can lightly sprinkle them with a tiny pinch of salt immediately after removing them from the oil.
6. Repeat: Continue frying the remaining rice cakes in batches, ensuring the oil temperature returns to the optimal range between batches.

Phase 3: Preparing the Toppings & Assembly

1. Prepare Spicy Tuna: In a medium bowl, flake the well-drained tuna with a fork. Add the Japanese mayonnaise, sriracha, soy sauce, toasted sesame oil, and optional chopped green onion. Mix gently until just combined. Be careful not to overmix, as this can make the tuna mushy. Taste and adjust seasoning if needed (more sriracha for heat, a touch more mayo for creaminess).
2. Prepare Creamy Avocado: In another small bowl, gently mash or dice the avocado. Add the fresh lime juice, a pinch of salt, and optional cilantro. Mix gently. Taste and adjust seasoning.
3. Assemble: Once the rice cakes have cooled slightly (they are best served warm, not piping hot from the fryer, to allow the toppings to sit well), it’s time to assemble!
   • Generously spoon or pipe your chosen toppings onto each crispy rice cake.
   • Garnish with toasted sesame seeds, thinly sliced jalapeños, furikake, microgreens, or any of your preferred garnishes.
4. Serve Immediately: Crispy rice cakes are best enjoyed fresh while the rice is still warm and crispy, and the toppings are cool and vibrant.