Bring water to a boil in a big pot.
Lower the heat and cook the cabbage rolls for 30-60 seconds, until a little softened. Drain well.
Preheat a nonstick pan over medium heat.
Add the onion, mushrooms and water and let it shimmer until the water has evaporated.
Add the minced beef and spices and stir to combine.
Add cauliflower rice and combine.
Add half of the tomato sauce to the minced beef mixture and combine well.
Add about 2 tablespoons of the beef mixture in the middle of each cabbage roll (make sure there's enough space on the sides.
Now fold the 3-4 cm closest to you over the top of the meat and roll it so that the edge is underneath the meat.
Fold in the right side of the cabbage leaf, and then the left side.
Last fold the upper side of the cabbage roll and place in a oven safe dish with the opening facing the bottom. Repeat with remaining cabbage leafs.
Top the cabbage rolls with the remaining sauce.
Bake in the oven for 1 hours (or until cabbage isreally soft).