Position an oven rack in the top of the oven and preheat the broiler. Line a baking sheet with foil.
Peel, remove the white pith and slice the grapefruit and oranges into rounds. Transfer to the prepared baking sheet. Sprinkle each round with a little sugar. Broil the citrus, watching closely, until the edges are beginning to brown, 2 to 3 minutes.
While the fruit cools, assemble the salad on a platter. Evenly scatter the arugula over the platter. Drizzle lightly with olive oil, top evenly with the citrus slices, diced avocado, sea salt, goat cheese, pomegranate seeds and pistachios.
Recipe courtesy of Kelsey Nixon