In a pan over medium-high heat, fry cauliflower rice with tamari - cook until it dries out (about 5-10 minutes).
Allow cauliflower to cool a bit and add to a bowl with cream cheese and rice wine vinegar. Mix together well and place in the fridge until cool.
Once the rice mixture is cooled, you can start making your sushi.
Place a nori sheet down on a board, rough side up (or bamboo rolling sheet if you have one. Spread some of the cauliflower rice mixture in a thin layer over the nori sheet, leaving about 2cm/¾ inch of empty space at the top.
Place all of the filling items along the sushi roll, don’t over fill.
Roll sushi tightly (using a bamboo sheet if you have one as this will give a tighter roll).
Repeat if you have ingredients left over.
Cut sushi into 2cm/½ inch portions and serve with lemon squeezed over the top and pickled ginger.