Combine the ingredients for the lime soya sauce in a small bowl and set aside.
Preheat a non stick pan over medium heat.
Fry the onion and garlic for 1-2 minutes until it starts to get lightly brown and soft.
Add button mushrooms and fry for another 2-3 minutes.
Meanwhile run the cauliflower in a blender until you have a rice-like texture.
Add the scallion and cauliflower to the pan and fry for 1-2 minutes.
Lower the heat low and season with salt, pepper, lemon juice and tamari.
Bring water to a boil in a big pot.
Separete the romaine lettuce leafs.
When water starts boiling lower the heat and let the water shimmer.
Add a few romaine lettuce leafs to the pot and let them soften for approximately one minute.
Take them out of the water, put on a plate havig the short side facing you, and add about 1 tbsp of the cauliflower mushroom mixture in the middle of the salad leaf.
Fold the edges of the salad and then roll together lengtwise.
Repeat until you have used all the mixture.
Serve with the lime soya sauce.