I picked up this homegrown incredibly fresh watercress this week at Farmer's market. I supremed the grapefruit, catching all the juices as I peeled and segmented the sections. I added a couple teaspoons of rice wine vinegar and some salt. pepper, diced scallion, and olive oil to make a vinaigrette. Toss the water cress in the vinaigrette and drain. Arrange the grapefruit segments and avocado slices over the cress and drizzle with additional vinaigrette.