Think of chirashi sushi (which conveniently means "scattered sushi") as a deconstructed sushi: raw fish slices and colorful toppings on a bed of vinegared sushi rice. It's an easy way to enjoy sushi at home without the labor of rolling and slicing.
This recipe uses tuna and salmon sashimi, but feel free to add or sub any raw fish of your choosing. Make sure to get your fish from a reputable brand or source, and sushi-grade if possible. The sushi rice requires some attention that might tempt you to use regular cooked rice instead. Don't skip it—you'll lose the sweet, tart flavor that complements the raw fish.