Avocado Grapefruit and Fennel Salad

fennel bulb, thinly sliced

avocado, peeled and cut into chunks

pink grapefruits, peeled and segmented

lightweight greens such as pea shoots, baby spinach, or watercress

Shaved Parmegiano-Reggiano cheese

Citrus dressing

For the Dressing

fresh squeezed grapefruit juice

extra virgin olive oil

white balsamic vinegar

minced shallot

grainy brown mustard

kosher salt

Freshy ground black pepper