Feathery light onion tempura is the perfect counterpoint to the smooth avocado and crisp radishes in this salad, and the spiciness of Chinese mustard is offset by the citrus vinaigrette.
To make the tempura: Separate the rings of the onion slices from one another and lay them in an even layer in a shallow baking dish. Stir the coconut juice, cream, and salt together and pour over the onions. Let the onions soak in this mixture for at least 1 hour. Mix the cornstarch, potato starch, and baking powder together in a shallow dish. Drain the onions and