Every other part is toxic. Not only are the leaves and seeds of the jicama toxic, but so is the skin of the jicama root itself. So be sure to peel it well. Luckily, the rough texture and ...

Into another small bowl, squeeze grapefruit membrane to release juice. Set aside. Peel jicama and cut into thin matchsticks about 2 inches long. Slice fennel bulb into very thin strips.