Preheat oven to 475ºF. Coat cauliflower with 1 tbsp. olive oil; place on a baking sheet and roast for 25 to 30 minutes or until lightly browned.
Reduce oven temperature to 350ºF and toast walnuts for 5 minutes or until lightly browned. Add to pan with cauliflower.
Heat remaining olive oil in a large skillet over medium-high heat. Add onion and sauté for 5 minutes or until lightly browned. Add garlic and jalapeno and cook for 2 minutes more. Stir in water, tomato paste, chili powder, cumin, oregano and salt; cook until mixture is thick and excess water has cooked off. Stir in cauliflower mixture.
Spoon mixture into warmed tortillas and top with cabbage, cheese, walnuts and cilantro. Serve with lime wedges.
Serving Size 2 Tacos each
Servings 0
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.