In a high-speed blender or food processor, add the beets, ½ cup toasted hazelnuts, citrus zest (if using), orange juice, lemon juice, olive oil, soy sauce, and salt.
Blend, starting at a low speed and increasing to a higher speed until the mixture is smooth. Taste and add more salt or lemon, if needed.
Serve the beet dip topped with chopped hazelnuts, olive oil, and black pepper. You could also sprinkle goat cheese on top, if you have any.