Fennel & Citrus Salad

INGREDIENTS:
  * 1 large fennel bulb - shaved
  * 2 blood oranges - peeled and sliced in rounds
  * 1 navel orange (optional)
  * 1 red or pink grapefruit - segmented
  * kosher salt & pepper
  * 2 tablespoons olive oil
  * 1 tablespoon fresh lemon juice

GARNISH:
  * ½ cup chopped roasted pistachios
  * flaky salt