Parsnip Rice: Put parsnips in a food processor and blend until almost a rice consistency.
Put the rest of ingredients in the food processor and blend until consistency resembles rice.
Orange Tamari Dipping Sauce: Mix all ingredients.
Sushi Rolls: Put nori sheet on a cutting board with perforated lines going vertically, and rough side facing up. If your nori does not have perforations, no big deal. You could use a bamboo mat, but it is not necessary.
Spread parsnip rice on top, covering about ¾ of the sheet.
Slice avocado and put in the middle of parsnip rice.
Starting at the end closest to you, start to roll by tucking nori under. While rolling pull roll in firmly, but not too tight. Roll until you get to the end and wet the edge with dipping sauce or water.
Slice along perforated edges. Use a really sharp knife or a knife with a serrated edge.