Cauliflower rice is popular in stores right now. If you can’t find it, simply process cauliflower in food processor until small and crumbled, to about the size of rice.
Try using 1/2 cup of cashews instead of 3/4 to reduce the fat content.
I use about 3 cups per 16 oz bag of pasta, so you will likely have leftovers. This sauce is delicious over veggies or whole grains.