Start by making the cauliflower "rice". Cut the cauliflower into florets, and process in the food processor until a rice is formed. Be careful not to overprocess!
Cut the red onion and mince the parsley, then fold into cauliflower rice. Set aside while you make the vinaigrette.
Vinaigrette
To make the dressing, combine all ingredients in a bowl and whisk until evenly combined. Add into tabbouleh and mix well.
Putting It All Together
Serve in bowls, garnished with hemp seeds and extra minced parsley.