If using raw beets: Preheat oven to 400 F, and line a baking sheet with foil. Grab a second sheet of foil, large enough to cover the baking sheet in foil.Remove the top and bottom of the beet (save the greens for a smoothie!), and slice in half. Toss beets in 1 tablespoon of oil, salt, and pepper. Cover and seal the beets with the second sheet of foil.Bake in preheated oven for 1 hour, until the beets are completely fork tender. Allow them to cool enough to handle, and use a paper towel to rub the beets, the skin will slide right off.
Whisk together the balsamic, dijon, salt, pepper, and garlic. Slowly drizzle in the olive oil while whisking with your other hand.
In a large bowl combine the baby arugula, goat cheese, pistachios, pomegranate seeds, and completely cooled beets.
Cover with dressing, toss, and enjoy! Best served immediately.