Sushi is an art form, but wow, can it be demanding. Expensive to buy, high-effort to make. The idea of a DIY hack is appealing to say the least. Apparently, though, we have an unlikely hero to the rescue: ice cube trays. Instead of rolling sushi on bamboo mats, a viral trend is encouraging "home chefs" to spoon fillings into these trays. This non-traditional trick probably sends shivers down the spines of every sushi master in the world. But if you're feeling controversial? Here's how to try it at home. This hack starts simple. Cover an ice cube tray with plastic wrap. Add your choice of sushi fillings (smoked salmon, avocado, and spicy mayo sauce are popular picks). You'll be flipping the tray at the end, so remember that this first layer will become your toppings. In case you're wondering, yes, sushi rice is absolutely necessary. The stickier texture comes from its higher amylopectin content , which basically holds everything together.…