Rainbow Poke with Sweet Potato Chips

Think of this as sushi without the rolling: seasoned rice, bright toppings and a savory dressing. Japanese cucumbers have tiny seeds and thin skin, so there is no need to peel or scoop them. Buy salmon labeled for raw eating and keep it on ice right up to the moment you slice it; cold fish cuts cleaner and tastes sweeter. Double the recipe for a crowd; the method scales easily.