How to Make It
Using a sharp knife, peel the oranges, removing all of the bitter white pith. Working over a small bowl, cut in between the membranes to release the sections.
Squeeze the membranes over a bowl to extract the juice. Whisk in the lime juice, vinegar, oil and cayenne; season with salt and pepper. Add the jicama and let stand for 15 minutes. Fold in the orange sections, avocado, feta and cilantro; serve.