HEAT the ghee in a large skillet over medium-high heat. Add the onion, bell pepper, and celery. Sauté for 3-5 minutes, until the vegetables are tender and lightly browned. Add the tomatoes and chicken to the pan along with all of the seasonings. Continue cooking for 5 minutes, stirring often.
STIR in the cauliflower rice, vegetable stock, and shrimp.
COVER, reduce heat to low, and simmer for about 5 minutes, until the cauliflower rice is tender and the shrimp are cooked through.