Prepare the vinaigrette. Slice the vanilla bean in half lengthwise and scrape the seeds carefully. In a small bowl, mix the oil, vanilla seeds and vinegar. Whisk until well blended and creamy. Let the vinaigrette rest for about an hour.
Cut the persimmons into halves and seed if necessary. Cut each half into half-inch cubes (approximately 8 cubes per persimmon). Cut the apple into half-inch cubes. (You want to make sure that apple and persimmon cubes are the same size.)
In a large bowl, gently toss the watercress, persimmon, apple and vinaigrette. Arrange on individual plates, sprinkle with pepper and top generously with Parmesan shavings. Serve immediately
Aleksandra aka QueenSashy is a scientist by day, and cook, photographer and doodler by night. When she is not writing code and formulas, she blogs about food, life and everything in between on her blog, Three Little Halves. Three Little Halves was nominated for 2015 James Beard Awards and the finalist for 2014 Saveur Best Food Blog Awards. Aleksandra lives in New York City with her other two halves, Miss Pain and Dr. V.